Add "pattern" category

[spenserblack]

Used for Regex and ABNF.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.12%. Comparing base (bf5ca9f) to head (759944a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
gengo/src/lib.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #492   +/-   ##
=======================================
  Coverage   71.12%   71.12%           
=======================================
  Files          18       18           
  Lines         516      516           
=======================================
  Hits          367      367           
  Misses        149      149           

Flag	Coverage Δ
--no-default-features	72.52% <0.00%> (ø)
--no-default-features --features color	70.73% <0.00%> (ø)
ubuntu-latest	71.12% <0.00%> (ø)

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[spenserblack]

@o2sh Would you want to be removed from the CODEOWNERS entry? I don't want to keep spamming you with review requests.