another addition to notification node

I'm checking this feature on my project
Merge pull request #892 from ardianys/patch-5

another addition to notification node
Update token.php
Update User Agent and WhatsApp verson
Merge pull request #917 from mgp25/patch-21

Update User Agent and WhatsApp verson
Merge pull request #916 from mgp25/patch-19

Update token.php
Added test for Rc4 class