message: Drop unused Babel plugin
  Follows
  Context:
diff: },
  "devDependencies": {
  "@babel/core": "^7.0.0",
  - "@babel/plugin-proposal-unicode-property-regex": "^7.0.0",
  "@babel/plugin-syntax-object-rest-spread": "^7.0.0",
  "@babel/plugin-transform-modules-commonjs": "^7.0.0",
  "@babel/plugin-transform-react-jsx": "^7.0.0",
  "useBuiltIns": true
  }
  ],
  - "@babel/plugin-proposal-unicode-property-regex",
  "@babel/plugin-syntax-object-rest-spread"
  ],
  "env": {
  