🐛 FIX: smartquotes punctuation char comparison

[hukkin]

This bug was found by running mypy with the strict_equality = True setting. I suggest we turn that setting on in #64

[codecov]

Codecov Report

Merging #72 (035c11c) into master (a874755) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #72   +/-   ##
=======================================
  Coverage   95.53%   95.53%           
=======================================
  Files          75       75           
  Lines        3740     3740           
=======================================
  Hits         3573     3573           
  Misses        167      167           

Flag	Coverage Δ
pytests	95.53% <100.00%> (ø)

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Impacted Files	Coverage Δ
markdown_it/common/utils.py	67.44% <100.00%> (ø)
markdown_it/rules_core/smartquotes.py	98.29% <100.00%> (ø)

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