fix build process for react-easy-state (bump webpack)

Author: solkimicreb

frameworks/keyed/react-easy-state/package.json

@@ -27,7 +27,7 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-react": "6.24.1",
     "jsx-loader": "0.13.2",
-    "webpack": "^4.0.0-beta.1"
+    "webpack": "4.16.3"
   },
   "dependencies": {
     "react": "16.1.0",