add IsTrueLike type

[samuelcolvin]

Also slightly tweak the implementation of IsFalseLike

[codecov]

Codecov Report

Merging #25 (2616625) into main (21ae21c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9        10    +1     
  Lines          584       607   +23     
  Branches       153       157    +4     
=========================================
+ Hits           584       607   +23     

Impacted Files	Coverage Δ
dirty_equals/__init__.py	100.00% <100.00%> (ø)
dirty_equals/_boolean.py	100.00% <100.00%> (ø)

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