Point at Google-specific OAuth2 lib since that's the only provider supported in 5.2.x

composer.json

@@ -27,7 +27,7 @@
         "phpunit/phpunit": "4.7.*"
     },
     "suggest": {
-        "league/oauth2-client": "Needed for XOAUTH2 authentication"
+        "league/oauth2-google": "Needed for Google XOAUTH2 authentication"
     },
     "autoload": {
         "classmap": [

get_oauth_token.php

@@ -12,11 +12,6 @@
  * This script requires PHP 5.4 or later
  * PHP Version 5.4
  */
-/**
- * Added a new class for getting the Refresh Token with right scopes
- * as the OAuth-Client for Google from GitHub didnot provide setting the 
- * scope out of the box
- */
 
 namespace League\OAuth2\Client\Provider;