New features:
- Add support for Python 3.8 and 3.9. (issue #569, pr #669 and #676 by @ods)
- Drop support for Python 3.5. (pr #667 by @ods)
- Add OAUTHBEARER as a new sasl_mechanism. (issue #618 and pr #630 by @oulydna)
Bugfixes:
- Fix memory leak in kafka consumer when consumer is in idle state not consuming any message. (issue #628 and pr #629 by @iamsinghrajat)