- update to 2.5.0:
* Update testtools/compat.py
* Note Python 3.5 is EOL and will be dropped after the next release
* Fix for Python 3.10
* Add python 3.10 to ci configuration
* testtools.compat: provide BytesIO, StringIO again
* Add support for Python 3.9
* Update and simplify workflow
* Fix UserWarning: Usage of dash-separated ...
* Fix tests with Python 3.10
* Remove mimeparse dependency
* trivial: Cleanup imports
* Re-introduce 'try\_imports'
* Remove use of 'try\_imports'
* tox: Don't skip sdist
* Remove use of 'safe\_hasattr'
* NEWS: Add note about unittest2 removal
* Fix github actions
* Update testtools/content.py
* Update tox.ini
* Update github actions config to use release 3.9
* Drop traceback2 in favor of traceback and remove unused linecache2
* Update tox.ini
* Add tox.ini file
* Remove tox.ini file
* restore testtools/tests/test\_testcase.py
* Remove unittest2 from setup.cfg and add tox.ini file
* Remove unrelated change
* Restore test\_spinner.py
* Remove unused try\_import