This is a incremental release that fixes several bugs and introduces
some new features. The biggest change is that this is the first release
to officially support running on Python 3.8. From this release stestr
supports running on Python 3.8, 3.7, 3.6, 3.5, and 2.7 (which is
deprecated and will be removed in the 3.0.0 release).

New Features
------------

* Add support for running on Python 3.8
* Add a new CLI flag for stestr run, --pdb, which does not launch a
  subprocess to run tests. It should be used when running tests with
  pdb.

Bug Fixes
---------

* Fix output attachment encoding in subunit-trace (#243)
* Escape Windows paths correctly (#269)
* Handle empty stestr directories correctly (#266)