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

Closes #3

Author: greenkeeper[bot]

package.json

@@ -6,7 +6,7 @@
     "axios": "^0.18.0",
     "react": "^16.5.2",
     "react-dom": "^16.5.2",
-    "react-scripts": "2.1.0"
+    "react-scripts": "3.0.0"
   },
   "scripts": {
     "start": "react-scripts start",