diff --git a/package-lock.json b/package-lock.json
index 6f5e54f..5d519f6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -202,7 +202,7 @@
             "dependencies": {
                 "file-type": {
                     "version": "3.9.0",
-                    "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+                    "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
                     "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek=",
                     "dev": true
                 }
@@ -382,7 +382,7 @@
         },
         "autoprefixer": {
             "version": "7.2.6",
-            "resolved": "http://registry.npmjs.org/autoprefixer/-/autoprefixer-7.2.6.tgz",
+            "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-7.2.6.tgz",
             "integrity": "sha512-Iq8TRIB+/9eQ8rbGhcP7ct5cYb/3qjNYAR2SnzLCEcwF6rvVOax8+9+fccgXk4bEhQGjOZd5TLhsksmAdsbGqQ==",
             "dev": true,
             "requires": {
@@ -1237,7 +1237,7 @@
                 },
                 "uuid": {
                     "version": "2.0.3",
-                    "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+                    "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
                     "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
                     "dev": true
                 }
@@ -1610,13 +1610,13 @@
             "dependencies": {
                 "file-type": {
                     "version": "3.9.0",
-                    "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+                    "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
                     "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek=",
                     "dev": true
                 },
                 "uuid": {
                     "version": "2.0.3",
-                    "resolved": "http://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
+                    "resolved": "https://registry.npmjs.org/uuid/-/uuid-2.0.3.tgz",
                     "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
                     "dev": true
                 }
@@ -1798,7 +1798,7 @@
         },
         "chalk": {
             "version": "1.1.3",
-            "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+            "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
             "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
             "requires": {
                 "ansi-styles": "^2.2.1",
@@ -3252,18 +3252,32 @@
             "dev": true
         },
         "elliptic": {
-            "version": "6.4.1",
-            "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.4.1.tgz",
-            "integrity": "sha512-BsXLz5sqX8OHcsh7CqBMztyXARmGQ3LWPtGjJi6DiJHq5C/qvi9P3OqgswKSDftbu8+IoI/QDTAm2fFnQ9SZSQ==",
+            "version": "6.5.4",
+            "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
+            "integrity": "sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==",
             "dev": true,
             "requires": {
-                "bn.js": "^4.4.0",
-                "brorand": "^1.0.1",
+                "bn.js": "^4.11.9",
+                "brorand": "^1.1.0",
                 "hash.js": "^1.0.0",
-                "hmac-drbg": "^1.0.0",
-                "inherits": "^2.0.1",
-                "minimalistic-assert": "^1.0.0",
-                "minimalistic-crypto-utils": "^1.0.0"
+                "hmac-drbg": "^1.0.1",
+                "inherits": "^2.0.4",
+                "minimalistic-assert": "^1.0.1",
+                "minimalistic-crypto-utils": "^1.0.1"
+            },
+            "dependencies": {
+                "bn.js": {
+                    "version": "4.12.0",
+                    "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+                    "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==",
+                    "dev": true
+                },
+                "inherits": {
+                    "version": "2.0.4",
+                    "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+                    "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+                    "dev": true
+                }
             }
         },
         "emojis-list": {
@@ -4129,7 +4143,7 @@
             "dependencies": {
                 "combined-stream": {
                     "version": "1.0.6",
-                    "resolved": "http://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+                    "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
                     "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
                     "dev": true,
                     "requires": {
@@ -4235,7 +4249,8 @@
                 "ansi-regex": {
                     "version": "2.1.1",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "aproba": {
                     "version": "1.2.0",
@@ -4256,12 +4271,14 @@
                 "balanced-match": {
                     "version": "1.0.0",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "brace-expansion": {
                     "version": "1.1.11",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "balanced-match": "^1.0.0",
                         "concat-map": "0.0.1"
@@ -4276,17 +4293,20 @@
                 "code-point-at": {
                     "version": "1.1.0",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "concat-map": {
                     "version": "0.0.1",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "console-control-strings": {
                     "version": "1.1.0",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "core-util-is": {
                     "version": "1.0.2",
@@ -4403,7 +4423,8 @@
                 "inherits": {
                     "version": "2.0.3",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "ini": {
                     "version": "1.3.5",
@@ -4415,6 +4436,7 @@
                     "version": "1.0.0",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "number-is-nan": "^1.0.0"
                     }
@@ -4429,6 +4451,7 @@
                     "version": "3.0.4",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "brace-expansion": "^1.1.7"
                     }
@@ -4436,12 +4459,14 @@
                 "minimist": {
                     "version": "0.0.8",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "minipass": {
                     "version": "2.2.4",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "safe-buffer": "^5.1.1",
                         "yallist": "^3.0.0"
@@ -4460,6 +4485,7 @@
                     "version": "0.5.1",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "minimist": "0.0.8"
                     }
@@ -4540,7 +4566,8 @@
                 "number-is-nan": {
                     "version": "1.0.1",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "object-assign": {
                     "version": "4.1.1",
@@ -4552,6 +4579,7 @@
                     "version": "1.4.0",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "wrappy": "1"
                     }
@@ -4637,7 +4665,8 @@
                 "safe-buffer": {
                     "version": "5.1.1",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "safer-buffer": {
                     "version": "2.1.2",
@@ -4673,6 +4702,7 @@
                     "version": "1.0.2",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "code-point-at": "^1.0.0",
                         "is-fullwidth-code-point": "^1.0.0",
@@ -4692,6 +4722,7 @@
                     "version": "3.0.1",
                     "bundled": true,
                     "dev": true,
+                    "optional": true,
                     "requires": {
                         "ansi-regex": "^2.0.0"
                     }
@@ -4735,12 +4766,14 @@
                 "wrappy": {
                     "version": "1.0.2",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 },
                 "yallist": {
                     "version": "3.0.2",
                     "bundled": true,
-                    "dev": true
+                    "dev": true,
+                    "optional": true
                 }
             }
         },
@@ -5111,7 +5144,7 @@
         },
         "got": {
             "version": "5.7.1",
-            "resolved": "http://registry.npmjs.org/got/-/got-5.7.1.tgz",
+            "resolved": "https://registry.npmjs.org/got/-/got-5.7.1.tgz",
             "integrity": "sha1-X4FjWmHkplifGAVp6k44FoClHzU=",
             "dev": true,
             "requires": {
@@ -5522,7 +5555,7 @@
         },
         "http-errors": {
             "version": "1.6.3",
-            "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+            "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
             "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
             "dev": true,
             "requires": {
@@ -7973,7 +8006,7 @@
         },
         "onetime": {
             "version": "1.1.0",
-            "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+            "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
             "integrity": "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k=",
             "dev": true
         },
@@ -7992,7 +8025,7 @@
         },
         "opn": {
             "version": "4.0.2",
-            "resolved": "http://registry.npmjs.org/opn/-/opn-4.0.2.tgz",
+            "resolved": "https://registry.npmjs.org/opn/-/opn-4.0.2.tgz",
             "integrity": "sha1-erwi5kTf9jsKltWrfyeQwPAavJU=",
             "requires": {
                 "object-assign": "^4.0.1",
@@ -8049,7 +8082,7 @@
         },
         "os-locale": {
             "version": "1.4.0",
-            "resolved": "http://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
+            "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
             "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
             "dev": true,
             "requires": {
@@ -8494,7 +8527,7 @@
                     "dependencies": {
                         "file-type": {
                             "version": "3.9.0",
-                            "resolved": "http://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
+                            "resolved": "https://registry.npmjs.org/file-type/-/file-type-3.9.0.tgz",
                             "integrity": "sha1-JXoHg4TR24CHvESdEH1SpSZyuek=",
                             "dev": true
                         }
@@ -8697,7 +8730,7 @@
             "dependencies": {
                 "async": {
                     "version": "1.5.2",
-                    "resolved": "http://registry.npmjs.org/async/-/async-1.5.2.tgz",
+                    "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
                     "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
                     "dev": true
                 },
@@ -10601,7 +10634,7 @@
             "dependencies": {
                 "convert-source-map": {
                     "version": "0.3.5",
-                    "resolved": "http://registry.npmjs.org/convert-source-map/-/convert-source-map-0.3.5.tgz",
+                    "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-0.3.5.tgz",
                     "integrity": "sha1-8dgClQr33SYxof6+BZZVDIarMZA=",
                     "dev": true
                 }
@@ -10804,7 +10837,7 @@
             "dependencies": {
                 "commander": {
                     "version": "2.8.1",
-                    "resolved": "http://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
+                    "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
                     "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
                     "dev": true,
                     "requires": {
@@ -11539,7 +11572,7 @@
         },
         "strip-ansi": {
             "version": "3.0.1",
-            "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+            "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
             "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
             "requires": {
                 "ansi-regex": "^2.0.0"
@@ -11566,7 +11599,7 @@
         },
         "strip-dirs": {
             "version": "1.1.1",
-            "resolved": "http://registry.npmjs.org/strip-dirs/-/strip-dirs-1.1.1.tgz",
+            "resolved": "https://registry.npmjs.org/strip-dirs/-/strip-dirs-1.1.1.tgz",
             "integrity": "sha1-lgu9EoeETzl1pFWKoQOoJV4kVqA=",
             "dev": true,
             "requires": {
@@ -11977,7 +12010,7 @@
                 },
                 "yargs": {
                     "version": "3.10.0",
-                    "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+                    "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
                     "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
                     "dev": true,
                     "requires": {
@@ -12844,7 +12877,7 @@
                 },
                 "yargs": {
                     "version": "6.6.0",
-                    "resolved": "http://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
+                    "resolved": "https://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
                     "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
                     "dev": true,
                     "requires": {
@@ -12865,7 +12898,7 @@
                 },
                 "yargs-parser": {
                     "version": "4.2.1",
-                    "resolved": "http://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+                    "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
                     "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
                     "dev": true,
                     "requires": {
diff --git a/yarn.lock b/yarn.lock
index 87c680d..466fafa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -926,9 +926,9 @@ bluebird@^3.1.1, bluebird@^3.5.1:
   version "3.5.1"
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
 
-bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.1.1, bn.js@^4.4.0:
-  version "4.11.8"
-  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.11.8.tgz#2cde09eb5ee341f484746bb0309b3253b1b1442f"
+bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.1.1, bn.js@^4.11.9:
+  version "4.12.0"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.12.0.tgz#775b3f278efbb9718eec7361f483fb36fbbfea88"
 
 body-parser@1.18.2:
   version "1.18.2"
@@ -1011,7 +1011,7 @@ braces@^2.3.0, braces@^2.3.1:
     split-string "^3.0.2"
     to-regex "^3.0.1"
 
-brorand@^1.0.1:
+brorand@^1.0.1, brorand@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/brorand/-/brorand-1.1.0.tgz#12c25efe40a45e3c323eb8675a0a0ce57b22371f"
 
@@ -2261,16 +2261,16 @@ electron-to-chromium@^1.2.7, electron-to-chromium@^1.3.30, electron-to-chromium@
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.52.tgz#d2d9f1270ba4a3b967b831c40ef71fb4d9ab5ce0"
 
 elliptic@^6.0.0:
-  version "6.4.0"
-  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.4.0.tgz#cac9af8762c85836187003c8dfe193e5e2eae5df"
+  version "6.5.4"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.4.tgz#da37cebd31e79a1367e941b592ed1fbebd58abbb"
   dependencies:
-    bn.js "^4.4.0"
-    brorand "^1.0.1"
+    bn.js "^4.11.9"
+    brorand "^1.1.0"
     hash.js "^1.0.0"
-    hmac-drbg "^1.0.0"
-    inherits "^2.0.1"
-    minimalistic-assert "^1.0.0"
-    minimalistic-crypto-utils "^1.0.0"
+    hmac-drbg "^1.0.1"
+    inherits "^2.0.4"
+    minimalistic-assert "^1.0.1"
+    minimalistic-crypto-utils "^1.0.1"
 
 emojis-list@^2.0.0:
   version "2.1.0"
@@ -3357,8 +3357,8 @@ hash-sum@^1.0.2:
   resolved "https://registry.yarnpkg.com/hash-sum/-/hash-sum-1.0.2.tgz#33b40777754c6432573c120cc3808bbd10d47f04"
 
 hash.js@^1.0.0, hash.js@^1.0.3:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/hash.js/-/hash.js-1.1.5.tgz#e38ab4b85dfb1e0c40fe9265c0e9b54854c23812"
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/hash.js/-/hash.js-1.1.7.tgz#0babca538e8d4ee4a0f8988d68866537a003cf42"
   dependencies:
     inherits "^2.0.3"
     minimalistic-assert "^1.0.1"
@@ -3376,7 +3376,7 @@ he@1.1.x, he@^1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
 
-hmac-drbg@^1.0.0:
+hmac-drbg@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
   dependencies:
@@ -3647,14 +3647,18 @@ inflight@^1.0.4:
     once "^1.3.0"
     wrappy "1"
 
-inherits@2, inherits@2.0.3, inherits@^2.0.1, inherits@^2.0.3, inherits@~2.0.0, inherits@~2.0.1, inherits@~2.0.3:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+inherits@2, inherits@^2.0.1, inherits@^2.0.3, inherits@^2.0.4, inherits@~2.0.0, inherits@~2.0.1, inherits@~2.0.3:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
 
 inherits@2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.1.tgz#b17d08d326b4423e568eff719f91b0b1cbdf69f1"
 
+inherits@2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+
 ini@^1.3.4, ini@~1.3.0:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
@@ -4656,7 +4660,7 @@ minimalistic-assert@^1.0.0, minimalistic-assert@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz#2e194de044626d4a10e7f7fbc00ce73e83e4d5c7"
 
-minimalistic-crypto-utils@^1.0.0, minimalistic-crypto-utils@^1.0.1:
+minimalistic-crypto-utils@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz#f6c00c1c0b082246e5c4d99dfb8c7c083b2b582a"
 
@@ -5105,7 +5109,7 @@ once@^1.3.0, once@^1.3.1, once@^1.4.0:
 
 onetime@^1.0.0:
   version "1.1.0"
-  resolved "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789"
+  resolved "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789"
 
 onetime@^2.0.0:
   version "2.0.1"