Add Stylelint as additional alias for the CheckStyle parser

[NotMyFault]

The change proposed adds a Stylelint checkstyle along the already added checkstyle-like reporters.

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[codecov]

Codecov Report

Merging #812 (0dede61) into master (2d42aa0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #812   +/-   ##
=========================================
  Coverage     92.76%   92.76%           
- Complexity     2147     2152    +5     
=========================================
  Files           318      319    +1     
  Lines          5968     5974    +6     
  Branches        601      601           
=========================================
+ Hits           5536     5542    +6     
  Misses          264      264           
  Partials        168      168           

Impacted Files	Coverage Δ
...du/hm/hafner/analysis/registry/ParserRegistry.java	100.00% <ø> (ø)
.../hafner/analysis/registry/StylelintDescriptor.java	100.00% <100.00%> (ø)

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[uhafner]

Thanks for your PR!