Comparisons: regex, iregex, date, datetime rework.

[szykin]

Based on #40
Safer check of an attribute name, is_match() now performs special handling for date and datetime fields.

[codecov-io]

Codecov Report

Merging #42 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #42   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines         634    672   +38     
=====================================
+ Hits          634    672   +38

Impacted Files	Coverage Δ
django_mock_queries/constants.py	100% <100%> (ø)	✅
django_mock_queries/utils.py	100% <100%> (ø)	✅

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[stphivos]

Awesome thanks!