FIX: Don't print warnings on second pass

[hukkin]

No description provided.

[codecov]

Codecov Report

Merging #167 (7585c8f) into master (ef86381) will decrease coverage by 0.08%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   95.14%   95.05%   -0.09%     
==========================================
  Files          14       14              
  Lines         844      849       +5     
==========================================
+ Hits          803      807       +4     
- Misses         41       42       +1     

Impacted Files	Coverage Δ
mdformat/codepoints/_unicode_punctuation.py	25.00% <0.00%> (ø)
mdformat/codepoints/_unicode_whitespace.py	25.00% <0.00%> (ø)
mdformat/_compat.py	70.00% <75.00%> (-1.43%)	⬇️
mdformat/_api.py	91.30% <100.00%> (+0.39%)	⬆️
mdformat/_cli.py	97.05% <100.00%> (-0.03%)	⬇️
mdformat/_util.py	93.33% <100.00%> (+0.31%)	⬆️

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