⬆️ UPGRADE: markdown-it-py v2, mdit-py-plugins v0.3

[chrisjsewell]

See https://github.com/executablebooks/markdown-it-py/releases/tag/v2.0.0,
and https://github.com/executablebooks/mdit-py-plugins/releases/tag/v0.3.0

closes #169

[codecov]

Codecov Report

Merging #449 (ef4ccd3) into master (a28e9b7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #449   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files          16       16           
  Lines        1877     1878    +1     
=======================================
+ Hits         1704     1705    +1     
  Misses        173      173           

Flag	Coverage Δ
pytests	90.78% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
myst_parser/docutils_.py	100.00% <100.00%> (ø)
myst_parser/docutils_renderer.py	92.78% <100.00%> (+0.03%)	⬆️
myst_parser/sphinx_parser.py	100.00% <100.00%> (ø)
myst_parser/sphinx_renderer.py	93.08% <100.00%> (ø)

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