gh-20 fix has_key method does not fetch the specified version.

[xncbf]

Closes #20

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8279852) 91.61% compared to head (0d6ec9a) 91.61%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files          11       11           
  Lines         310      310           
=======================================
  Hits          284      284           
  Misses         26       26           

Files Changed	Coverage Δ
django_dynamodb_cache/cache.py	95.13% <100.00%> (ø)

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