fix linting error in react-native.config.js

Author: zetavg

App/react-native.config.js

@@ -1,5 +1,5 @@
 module.exports = {
   dependencies: {
-    'react-native-flipper': { platforms: { ios: null } }
-  }
-}
+    'react-native-flipper': { platforms: { ios: null } },
+  },
+};