setup: drop support for Python 3.5
We talked about this on the mailing list [1] and there seemed to be
agreement that Python 3.5 is effectively dead and no longer worth
supporting.
So this commit changes our minimum version requirement to 3.6.2.
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2022-February/147885.html
Differential Revision: https://phab.mercurial-scm.org/D12315
#require rustfmt test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "$TESTDIR"/..
Warning: Keep this in sync with hghave.py
$ RUSTFMT=$(rustup which --toolchain nightly-2021-11-02 rustfmt)
$ for f in `testrepohg files 'glob:**/*.rs'` ; do
> $RUSTFMT --check --edition=2018 --unstable-features --color=never $f
> done