fix(package): update react-scripts to version 3.4.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -6,7 +6,7 @@
     "react": "^16.6.0",
     "react-dom": "^16.6.0",
     "react-redux": "^6.0.0",
-    "react-scripts": "3.1.0",
+    "react-scripts": "3.4.0",
     "redux": "^4.0.1",
     "redux-logger": "^3.0.6",
     "redux-saga": "^0.16.2"