Handle background update in a right way and add an option to control it

[Krukov]

fix for issue #265

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.81%. Comparing base (3ab8f37) to head (258a0c3).

Files with missing lines	Patch %	Lines
cashews/decorators/cache/hit.py	66.66%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
- Coverage   93.85%   93.81%   -0.04%     
==========================================
  Files          54       54              
  Lines        3564     3574      +10     
  Branches      620      622       +2     
==========================================
+ Hits         3345     3353       +8     
- Misses        109      110       +1     
- Partials      110      111       +1     

Flag	Coverage Δ
unittests	93.70% <87.50%> (-0.04%)	⬇️

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