Add PT028 (checks for default arguments in test functions)

[m-burst]

Fixes #316

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.76%. Comparing base (a7fee05) to head (92c0803).
Report is 26 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
+ Coverage   96.66%   96.76%   +0.10%     
==========================================
  Files          13       14       +1     
  Lines         599      619      +20     
  Branches      129      126       -3     
==========================================
+ Hits          579      599      +20     
  Misses          7        7              
  Partials       13       13              

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