merge changes

Author: Lee Kwang Chin

class.GitHubHook.php

@@ -40,7 +40,7 @@ class GitHubHook
    * @var array GitHub's IP addresses for hooks.
    * @since 1.1
    */
-  private $_ips = array('207.97.227.253', '50.57.128.197', '108.171.174.178', '50.57.231.61', '54.235.183.49', '54.235.183.23', '54.235.118.251', '54.235.120.57', '54.235.120.61', '54.235.120.62');
+  private $_ips = array('54.235.183.49', '54.235.183.23', '54.235.118.251', '54.235.120.57', '54.235.120.61', '54.235.120.62');
 
   /**
    * Constructor.