Support spaces between equal sign for html attributes

[Jonarod]

Even with regex and comments supporting whitespaces between attributes and values (<tag key = val />), the code itself does not account for these spaces and includes them into final strings generating inconsistent parsing like "foo instead of foo or class instead of class...

I added very lightweight change to trim() leading and trailing spaces if any.
See #161

Plus I wrote test cases to prevent any future regression.

[codecov]

Codecov Report

Merging #162 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #162   +/-   ##
=======================================
  Coverage   99.69%   99.69%           
=======================================
  Files           1        1           
  Lines         328      328           
  Branches       47       47           
=======================================
  Hits          327      327           
  Misses          1        1

Impacted Files	Coverage Δ
index.js	99.69% <100%> (ø)	⬆️

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[quantizor]

Thank you! Makes perfect sense

[quantizor]

I’ll probably release this tomorrow when I have some free time 👍