Changes

Features

• Support GenericAliases (MultiDict[str]) for Python 3.9+
  #553 <https://github.com/aio-libs/multidict/issues/553>_

Bugfixes

• Synchronize the declared supported Python versions in setup.py with actually supported and tested ones.
  #552 <https://github.com/aio-libs/multidict/issues/552>_