Releasing v11.1

Use a dual license file until we can add two files.

requirements-dev.txt: Added missing 'wheel' package

Without it we can't run 'setup.py bdist_wheel'

Bump to v10.0.2

Bump to v10.0.1

Bump version to v10.0.0

[ci skip]

Bump to 9.0.0 + changelog

CHANGES.rst: fix some typo's (python-telegram-bot#874)

Bump version & update CHANGES.rst for 8.1.0 release

Bump to version 8.0