Update dependency react-scripts to v2.1.8

Author: renovate-bot

package.json

@@ -9,7 +9,7 @@
     "react-dom": "16.7.0",
     "react-redux": "5.0.6",
     "react-router-dom": "4.2.2",
-    "react-scripts": "2.1.3",
+    "react-scripts": "2.1.8",
     "redux": "3.7.2"
   },
   "scripts": {