Memory redlock implementation

[argaen]

No description provided.

[codecov-io]

Codecov Report

Merging #241 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #241      +/-   ##
=========================================
+ Coverage    99.1%   99.1%   +<.01%     
=========================================
  Files          13      13              
  Lines         779     784       +5     
  Branches       81      82       +1     
=========================================
+ Hits          772     777       +5     
  Misses          7       7

Impacted Files	Coverage Δ
aiocache/backends/memory.py	100% <100%> (ø)	⬆️

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