Upgrade webpack & webpack plugins

Author: alexdevero

package.json

@@ -52,19 +52,19 @@
     "@babel/preset-react": "^7.0.0",
     "babel-loader": "^8.0.6",
     "babili-webpack-plugin": "^0.1.2",
-    "css-loader": "^3.1.0",
+    "css-loader": "^3.2.0",
     "electron-packager": "^14.0.3",
-    "file-loader": "^4.1.0",
+    "file-loader": "^4.2.0",
     "html-webpack-plugin": "^3.2.0",
     "mini-css-extract-plugin": "^0.8.0",
     "postcss-cssnext": "^3.1.0",
     "postcss-import": "^12.0.1",
     "postcss-loader": "^3.0.0",
     "postcss-nested": "^4.1.2",
     "postcss-pxtorem": "^4.0.1",
-    "style-loader": "^0.23.1",
-    "webpack": "^4.38.0",
-    "webpack-cli": "^3.3.6",
-    "webpack-dev-server": "^3.7.2"
+    "style-loader": "^1.0.0",
+    "webpack": "^4.39.3",
+    "webpack-cli": "^3.3.7",
+    "webpack-dev-server": "^3.8.0"
   }
 }