Update dependency css-loader to v1

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-react": "6.24.1",
     "codemirror": "5.39.2",
-    "css-loader": "0.28.11",
+    "css-loader": "1.0.0",
     "eslint": "4.19.1",
     "eslint-plugin-react": "7.5.1",
     "extract-text-webpack-plugin": "3.0.2",