Remove t/untaint.t

[oalders]

Fixes #376

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (704ed6a) 89.40% compared to head (17db4d7) 89.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #377   +/-   ##
=======================================
  Coverage   89.40%   89.40%           
=======================================
  Files           3        3           
  Lines         868      868           
  Branches      230      230           
=======================================
  Hits          776      776           
  Misses         37       37           
  Partials       55       55           

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