Plugin system for code formatting #12

[hukkin]

Closes #12

[codecov-commenter]

Codecov Report

Merging #15 into master will decrease coverage by 1.99%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   97.71%   95.72%   -2.00%     
==========================================
  Files           8        9       +1     
  Lines         350      374      +24     
==========================================
+ Hits          342      358      +16     
- Misses          8       16       +8     

Impacted Files	Coverage Δ
mdformat/_renderer/token_renderers.py	95.23% <16.66%> (-4.77%)	⬇️
mdformat/_util.py	83.33% <60.00%> (-16.67%)	⬇️
mdformat/plugins.py	88.88% <88.88%> (ø)
mdformat/_api.py	90.47% <100.00%> (+1.58%)	⬆️
mdformat/_cli.py	92.59% <100.00%> (+0.28%)	⬆️

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