add babel plugins/presets to package.json

Author: kitze

packages/react-scripts/package.json

@@ -26,7 +26,9 @@
     "babel-eslint": "7.2.3",
     "babel-jest": "20.0.3",
     "babel-loader": "7.1.1",
+    "babel-plugin-transform-decorators-legacy": "^1.3.4",
     "babel-preset-react-app": "^3.0.2",
+    "babel-preset-stage-0": "^6.24.1",
     "babel-runtime": "6.23.0",
     "case-sensitive-paths-webpack-plugin": "2.1.1",
     "chalk": "1.1.3",