fix(package): update react to version 16.8.0

Closes #6

Author: greenkeeper[bot]

package.json

@@ -7,7 +7,7 @@
     "test": "jest"
   },
   "dependencies": {
-    "react": "16.6.1",
+    "react": "16.8.0",
     "react-native": "0.57.5"
   },
   "devDependencies": {