diff --git a/package-lock.json b/package-lock.json
index 82580d6..b0e712e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1983,7 +1983,7 @@
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 				"readable-stream": {
 					"version": "2.3.6",
-					"resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+					"resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
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@@ -2106,7 +2106,8 @@
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 			"resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
-			"integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
+			"integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
+			"optional": true
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 		"constants-browserify": {
 			"version": "1.0.0",
@@ -2848,17 +2849,29 @@
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 		},
 		"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==",
 			"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=="
+				},
+				"inherits": {
+					"version": "2.0.4",
+					"resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+					"integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
+				}
 			}
 		},
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@@ -3267,7 +3280,7 @@
 			"dependencies": {
 				"core-js": {
 					"version": "1.2.7",
-					"resolved": "http://registry.npmjs.org/core-js/-/core-js-1.2.7.tgz",
+					"resolved": "https://registry.npmjs.org/core-js/-/core-js-1.2.7.tgz",
 					"integrity": "sha1-ZSKUwUZR2yj6k70tX/KYOk8IxjY="
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@@ -3414,7 +3427,7 @@
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 				"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": {
@@ -5045,6 +5058,7 @@
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 			"resolved": "https://registry.npmjs.org/minipass/-/minipass-2.3.5.tgz",
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+			"optional": true,
 			"requires": {
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 				"yallist": "^3.0.0"
@@ -5053,7 +5067,8 @@
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 					"version": "3.0.3",
 					"resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
-					"integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A=="
+					"integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
+					"optional": true
 				}
 			}
 		},
@@ -6951,7 +6966,7 @@
 		},
 		"readable-stream": {
 			"version": "1.1.14",
-			"resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+			"resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
 			"integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
 			"dev": true,
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@@ -6978,7 +6993,7 @@
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 				"readable-stream": {
 					"version": "2.3.6",
-					"resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+					"resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
 					"integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
 					"requires": {
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@@ -7140,7 +7155,7 @@
 			"dependencies": {
 				"jsesc": {
 					"version": "0.5.0",
-					"resolved": "http://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
+					"resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
 					"integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0="
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@@ -7927,7 +7942,7 @@
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 		"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"