Merge pull request #3 from the-road-to-react-with-firebase/greenkeeper/react-scripts-3.0.0

fix(package): update react-scripts to version 3.0.0

Author: rwieruch

package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "react": "^16.6.3",
     "react-dom": "^16.6.3",
-    "react-scripts": "2.1.1"
+    "react-scripts": "3.0.0"
   },
   "scripts": {
     "start": "react-scripts start",