Update to Bot API 8.2

Update to Bot API 8.1

Update to Bot API 8.0

chatadminrights: tweak tests

Update HTTP client limiter and improve dispatcher.

This new release introduces a significant improvement for the HTTP
client limiter, increasing its burst size and adding it as an
argument for SetGlobalRequestLimit and SetChatRequestLimit.
With the current changes the speed to which the client makes requests to
the Telegram API is as fast as possible until the limit is reached.

Additionally the dispatcher now uses sync.Map for keeping track of the
open chat sessions with the users improving the resulting safety for
concurrent use.

Update to Bot API 7.10

api.go: add tests

api.go: update tests

types.go: add tests

Update to Bot API 7.6