modify webpack.plugin.config.js

* use style-loader

package.json

@@ -105,6 +105,7 @@
     "sass-loader": "^6.0.3",
     "sinon": "~1.14.0",
     "sinon-chai": "~2.7.0",
+    "style-loader": "^0.13.2",
     "to-string-loader": "^1.1.5",
     "webpack": "~2.2.1",
     "webpack-manifest-plugin": "~1.1.0",

webpack.plugin.config.js

@@ -18,7 +18,7 @@ var config = {
     ],
   },
   module: {
-    loaders: [
+    rules: [
       {
         test: /.jsx?$/,
         exclude: /node_modules/,
@@ -28,11 +28,11 @@ var config = {
       },
       {
         test: /\.css$/,
-        use: ['to-string-loader', 'css-loader'],
+        use: ['style-loader', 'css-loader'],
       },
       {
         test: /\.scss$/,
-        use: ['to-string-loader', 'css-loader', 'sass-loader'],
+        use: ['style-loader', 'css-loader', 'sass-loader'],
       },
     ]
   },