- update to version 5.0
* Fix test failures and deprecation warnings occurring when
using Python 3.8a1.
* Drop support for Python 3.4.
4.9*
* Fix AssertionError in _DummyThread.isAlive on Python 3.
* Drop support for Python 3.3.
* Add support for Python 3.7.
* Remove untested support for the --pychecker option.
* Update the command line interface to use argparse instead of
optparse.
* Use ipdb instead of pdb for post-mortem debugging if available.
* Add a –require-unique option to check for duplicate test IDs.
* Reintroduce optional support for subunit.
* Handle string in exception values when formatting chained
exceptions.
4.8*
* Enable DeprecationWarning earlier, when discovering test
modules.
* Automatically enable DeprecationWarning when running tests.
- Launch tests using multibuild.