Invalid tag characters

[damanm24]

Fixes: #

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Short description of what this resolves:

Added a rule to check for special characters in tag names.

Proposed changes:

-

👍 Thank you!

[codecov]

Codecov Report

Merging #329 into develop will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           develop   #329   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files            1      1           
  Lines            1      1           
  Branches         1      1           
======================================
  Hits             1      1

Impacted Files	Coverage Δ
dist/htmlhint.js	100% <ø> (ø)	⬆️

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