fix: ensure tokenizer can handle equals in attrs (#29)

[Kylea650]

Closes (#29).

When a '=' was found within an attribute, it would increment the position unnecessarily, causing an out-of-bounds panic when performing: Value: trim(b[pos+1 : i]).

We should instead only do this when we are !inquote.

Test added to cover this.

[muktihari]

@Kylea650 Nice catch! Thank you for creating the issue and providing the PR fix.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d4090a1) to head (740acc3).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #30   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          300       302    +2     
=========================================
+ Hits           300       302    +2     

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