degrade eslint

eslint4.0 has some problem

Author: PanJiaChen

package.json

@@ -50,7 +50,7 @@
     "copy-webpack-plugin": "4.0.1",
     "cross-env": "5.0.1",
     "css-loader": "0.28.4",
-    "eslint": "4.0.0",
+    "eslint": "3.19.0",
     "eslint-friendly-formatter": "3.0.0",
     "eslint-import-resolver-webpack": "0.8.1",
     "eslint-loader": "1.7.1",