0.21.8

• Adds the possibility to add a function called _stopping_service to the tomodachi Service class, which is run as soon as a termination signal is received by the service. (github: @justcallmelarry)
• Fix for potential exceptions on botocore session client raising a RuntimeError, resulting in a tomodachi "Client has never been created in the first place" exception on reconnection to AWS APIs.
• Added Python 3.10 to the CI test matrix run via GitHub Actions.
• Additional updates for compatibility with typing libraries to improve support for installations on Python 3.10.
• Supports aiohttp 3.8.x versions.
• Supports tzlocal 3.x and 4.x releases.