Moved extract-text-webpack-plugin from devDependencies to dependencies

package.json

@@ -104,6 +104,7 @@
     "exports-loader": "^0.6.4",
     "express": "4.16.0",
     "express-static-gzip": "^0.3.1",
+    "extract-text-webpack-plugin": "^3.0.2",
     "file-loader": "^0.11.2",
     "form-data": "^2.3.1",
     "fs-extra": "^4.0.1",
@@ -213,7 +214,6 @@
     "enzyme-adapter-react-15": "^1.0.0",
     "eslint": "^4.5.0",
     "eslint-plugin-mocha": "^4.11.0",
-    "extract-text-webpack-plugin": "^3.0.2",
     "husky": "^0.14.3",
     "identity-obj-proxy": "^3.0.0",
     "ip": "^1.1.5",