✨ NEW: Add smartquotes

[tsutsu3]

#5

Summary

Ported smartquotes.js

Changed

• Add two test cases that were updated in the js ver.
• Changed the test case from <br> to <br /> to match the default commonmark preset

[codecov]

Codecov Report

Merging #67 into master will increase coverage by 0.09%.
The diff coverage is 98.31%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   95.31%   95.40%   +0.09%     
==========================================
  Files          74       75       +1     
  Lines        3627     3745     +118     
==========================================
+ Hits         3457     3573     +116     
- Misses        170      172       +2     

Flag	Coverage Δ
pytests	95.40% <98.31%> (+0.09%)	⬆️

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Impacted Files	Coverage Δ
markdown_it/rules_core/smartquotes.py	98.29% <98.29%> (ø)
markdown_it/parser_core.py	100.00% <100.00%> (ø)
markdown_it/rules_core/__init__.py	100.00% <100.00%> (ø)

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[chrisjsewell]

looks great thanks!