chore(package): update url-loader to version 2.0.0

Closes #534

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "rollup-plugin-uglify": "^2.0.0",
     "sinon": "^4.1.2",
     "style-loader": "0.19.0",
-    "url-loader": "0.6.2",
+    "url-loader": "2.0.0",
     "webpack": "3.8.1",
     "webpack-dev-server": "2.7.1",
     "yargs": "10.0.3"