Fix: Add missed peer dependency

Author: sapegin

package.json

@@ -27,6 +27,7 @@
     "babel-loader": "~6.2.8",
     "babel-preset-react-app": "~1.0.0",
     "css-loader": "0.25.0",
+    "file-loader": "~0.9.0",
     "json-loader": "0.5.4",
     "postcss-loader": "~1.1.1",
     "style-loader": "0.13.1",