v6.2.0

Changelog

685a9ae Update CHANGELOG.md for v6.2.0
8f5194e Merge pull request #348 from praekeltfoundation/add-whatsapp-quickreply-responses
def34c6 Add handling for button whatsapp message type
f30770a Bump CI testing to PG 11 and 12
a04d05c Merge pull request #339 from Ilhasoft/kaleyra-handler
41eb384 Add tests to receiveMsg
7212cc7 add url preview support to kaleyra handler
3595292 change kaleyra media base form to caption
3563a9c Remove unused types in kaleyra handler
02cdb89 Merge remote-tracking branch 'nyaruka/master' into kaleyra-handler
cc0eb71 Support outgoing medias on Kaleyra handler
83bbced Add tests to Kaleyra handler
7ea8a39 Add Kaleyra handler