added :only-text pseudo-class support

[niklak]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.82%. Comparing base (478c8ba) to head (56fe743).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/matcher.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   81.02%   81.82%   +0.80%     
==========================================
  Files          13       13              
  Lines        1939     1948       +9     
==========================================
+ Hits         1571     1594      +23     
+ Misses        368      354      -14     

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