moving code for group name update notification


new group name update notification is like this
                    rx  <notification from="6285643077333-1407815451@g.us" id="894086480" participant="6285643077333@s.whatsapp.net" type="subject" t="1407815452" notify="Ardian Yuli">
                    rx    <body>New Group Name</body>
                    rx  </notification>
Merge pull request #879 from ardianys/patch-3

moving code for group name update notification