fix: improve the performance parsing link labels

[frostming]

Fix #119

[codecov]

Codecov Report

Base: 95.58% // Head: 95.28% // Decreases project coverage by -0.29% ⚠️

Coverage data is based on head (f24b320) compared to base (f904b65).
Patch coverage: 91.27% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   95.58%   95.28%   -0.30%     
==========================================
  Files          19       19              
  Lines        1790     1868      +78     
  Branches      294      320      +26     
==========================================
+ Hits         1711     1780      +69     
- Misses         42       46       +4     
- Partials       37       42       +5     

Flag	Coverage Δ
unittests	95.28% <91.27%> (-0.30%)	⬇️

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Impacted Files	Coverage Δ
marko/patterns.py	100.00% <ø> (ø)
marko/inline_parser.py	95.38% <90.09%> (-1.86%)	⬇️
marko/block.py	96.55% <92.85%> (+0.07%)	⬆️
marko/helpers.py	98.70% <95.00%> (-0.57%)	⬇️

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