Apply fixes from StyleCI (musonza#264)

Apply fixes from StyleCI (musonza#248)

Merge pull request musonza#245 from musonza/revert-244-revert-242-pat…

…ch-1

Revert "Revert "Update to L7.x""

Update ConversationService.php (musonza#232)

WIP listen for message deletion (musonza#227)

* listen for message deletion

Apply fixes from StyleCI (musonza#230)

Update README.md

Update MessageService.php (musonza#225)