✨ NEW: Add colon_fence plugin

[chrisjsewell]

No description provided.

[codecov]

Codecov Report

Merging #91 (be77e22) into master (7e90750) will increase coverage by 0.01%.
The diff coverage is 96.82%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   95.67%   95.69%   +0.01%     
==========================================
  Files          77       78       +1     
  Lines        3907     3970      +63     
==========================================
+ Hits         3738     3799      +61     
- Misses        169      171       +2     

Flag	Coverage Δ
pytests	95.69% <96.82%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
markdown_it/extensions/colon_fence.py	96.82% <96.82%> (ø)

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