Add missing comma to comment

[krfisc88]

Comment regarding use of spread operator to extend existing minimizers lacked a comma causing syntax errors

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

To prevent future noobs from struggling with extending existing minimizers, I have added a comma to the comment.

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #49 (822d001) into master (2afc01b) will decrease coverage by 8.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   97.58%   89.51%   -8.07%     
==========================================
  Files           5        5              
  Lines         248      248              
  Branches       93       93              
==========================================
- Hits          242      222      -20     
- Misses          5       23      +18     
- Partials        1        3       +2     

Impacted Files	Coverage Δ
src/Webpack5Cache.js	0.00% <0.00%> (-100.00%)	⬇️
src/index.js	91.71% <0.00%> (-5.53%)	⬇️

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