Drop support for python 2.7 & mercurial < 5.2
This adjusts the supported versions on the default branch to match that stated in the release notes for 0.10.0.
It also bumps the version in setup.py to 0.11.0dev, while at it.
Meet users and developers of Mercurial at the London Sprint, May 27-29th https://mercurial-scm.org/news/2026/0001-london-sprint
This adjusts the supported versions on the default branch to match that stated in the release notes for 0.10.0.
It also bumps the version in setup.py to 0.11.0dev, while at it.