add php 7.3 to travis

Add PHPStan

Fix sendToActiveChats

fixes #897

Bot API 4.0 - NO Telegram Passport

[skip ci]

Add setting to define custom MySQL port.

Implement Telegram Games platform.

#858 add chat action constants

# Conflicts:
#	README.md

Make the code snippets a bit more readable.

Throw unique exception on invalid token and log raw response

Fix getStickerSet (#836)