Update formatting of index.js

Author: joeferraro

index.js

@@ -1,5 +1,5 @@
 import React from 'react';
-import {NativeModules, Platform} from 'react-native';
+import { NativeModules, Platform } from 'react-native';
 const invariant = require('invariant');
 const RNCookieManagerIOS = NativeModules.RNCookieManagerIOS;
 const RNCookieManagerAndroid = NativeModules.RNCookieManagerAndroid;
@@ -8,17 +8,17 @@ let CookieManager;
 
 if (Platform.OS === 'ios') {
     invariant(RNCookieManagerIOS,
-        'Add RNCookieMangerIOS.h and RNCookieManagerIOS.m to your Xcode project');
+        'react-native-cookies: Add RNCookieMangerIOS.h and RNCookieManagerIOS.m to your Xcode project');
     CookieManager = RNCookieManagerIOS;
 } else if (Platform.OS === 'android') {
-    invariant(RNCookieManagerAndroid, 
-        'Import libraries to android "rnpm link"');
+    invariant(RNCookieManagerAndroid,
+        'react-native-cookies: Import libraries to android "react-native link react-native-cookies"');
     CookieManager = RNCookieManagerAndroid;
 } else {
-    invariant(CookieManager, 'Invalid platform. This library only supports Android and iOS.');
+    invariant(CookieManager, 'react-native-cookies: Invalid platform. This library only supports Android and iOS.');
 }
 
-var functions = [
+const functions = [
     'set',
     'setFromResponse',
     'getFromResponse',
@@ -29,6 +29,6 @@ var functions = [
 ];
 
 module.exports = {}
-for (var i=0; i < functions.length; i++) {
+for (var i = 0; i < functions.length; i++) {
     module.exports[functions[i]] = CookieManager[functions[i]];
-}
+}