chore(package): update react-scripts to version 2.1.8

Closes #32

Author: greenkeeper[bot]

package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "devDependencies": {
-    "react-scripts": "0.9.5",
+    "react-scripts": "2.1.8",
     "serve": "^5.0.1"
   },
   "dependencies": {