Add method to add Member to an organization

Author: phpdreams

lib/Github/Api/Organization/Members.php

@@ -44,6 +44,11 @@ public function check($organization, $username)
         return $this->get('orgs/'.rawurlencode($organization).'/public_members/'.rawurlencode($username));
     }
 
+    public function addMember($team, $username)
+    {
+        return $this->put('orgs/'.rawurlencode($team).'/memberships/'.rawurlencode($username));
+    }
+
     public function publicize($organization, $username)
     {
         return $this->put('orgs/'.rawurlencode($organization).'/public_members/'.rawurlencode($username));