Lock mistune version

[lepture]

I'm rewriting mistune now. Mistune 2.0 will break its API.

[codecov-io]

Codecov Report

Merging #43 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #43   +/-   ##
=======================================
  Coverage   96.14%   96.14%           
=======================================
  Files           3        3           
  Lines         778      778           
=======================================
  Hits          748      748           
  Misses         30       30

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[lepture]

ping... I'm going to make a v2.0 release soon.

[mcepl]

Could you instead help to bring m2r to mistune 2.0 API, please? I am the lead Python maintainer for openSUSE and mistune puts us between a rock and a hard place: m2r is broken by 2.0 API and HyperKitty is broken by mistune < 2.0. I may kick m2r from the distribution, but it would be a pitty, because it is an useful small utility.

[amyreese]

I forked m2r/m2r2 and upgraded the project to support mistune 2.0: https://sphinx-mdinclude.readthedocs.io/en/latest/

[kloczek]

Why not update for latest mistune? 🤔

[kloczek]

If someone would be looking for some hints about move to mistune v3 here it is some sample jupyter/nbconvert#1820