Remove old cached_property implementation

[akx]

Fixes #44

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.03%. Comparing base (1bb5e7e) to head (3e5202a).

Files with missing lines	Patch %	Lines
minique/utils/__init__.py	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   92.00%   92.03%   +0.03%     
==========================================
  Files          27       28       +1     
  Lines        1050     1054       +4     
  Branches       80       80              
==========================================
+ Hits          966      970       +4     
  Misses         53       53              
  Partials       31       31              

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[teroyks]

Begone!

Appreciate adding the deprecation warning – hopefully people will fix their code…