message: fix: fix deps of example
diff: "devDependencies": {
  "@babel/core": "^7.2.2",
  "@babel/preset-env": "^7.2.0",
  - "@babel/preset-react": "^7.2.0",
  + "@babel/preset-react": "^7.0.0",
  "babel-loader": "^8.0.4",
  "copy-webpack-plugin": "^4.6.0",
  "eslint": "^5.10.0",
  