Evolve 11.1.5 released

[Anton Shestakov]

We released a new version of the evolve extension: 11.1.5.

As usual, the release is available on PyPI, and upgrade is recommended: 
https://pypi.org/project/hg-evolve/11.1.5/

This is a bugfix release. The most notable change is the compatibility 
with the upcoming Mercurial 6.9. Also the cleanup step of `hg evolve 
--abort` tries to be more careful when accessing revisions that might 
not exist. Documentation and tests were updated to be closer to the 
modern Python packaging standards.

Thanks to all the people involved:

  * Anton Shestakov <av6 at dwimlabs.net>
  * Manuel Jacob <me at manueljacob.de>
  * Pierre-Yves David <pierre-yves.david at octobus.net>

## Evolve: 11.1.5

   * compatibility with Mercurial 6.9

   * evolve: check that the evolved revisions are indeed in the repo 
during abort, fixes an issue when trying to access them during cleanup step

   * docs: update installation instructions due to PEP 668
   * docs: minor edits and fixes in evolve and topic tutorials

   * tests: more tests related to Python packaging

## Topic 1.1.5

   * compatibility with Mercurial 6.9