add react-jsx-self plugin explicitly

see facebook#6099 for details

Author: just-boris

packages/react-scripts/package.json

@@ -27,6 +27,7 @@
     "@babel/core": "7.3.4",
     "@svgr/webpack": "4.1.0",
     "@babel/plugin-transform-react-jsx": "7.3.0",
+    "@babel/plugin-transform-react-jsx-self": "7.2.0",
     "@typescript-eslint/eslint-plugin": "1.4.1",
     "@typescript-eslint/parser": "1.4.1",
     "babel-core": "7.0.0-bridge.0",