Implement gets cas commands

[argaen]

For more info on the cas cmd: https://github.com/memcached/memcached/blob/master/doc/protocol.txt#L130

For more info on the gets cmd: https://github.com/memcached/memcached/blob/master/doc/protocol.txt#L214

[codecov-io]

Current coverage is 88.27% (diff: 72.72%)

Merging #33 into master will decrease coverage by 2.88%

@@             master        #33   diff @@
==========================================
  Files             5          5          
  Lines           249        290    +41   
  Methods           0          0          
  Messages          0          0          
  Branches         38         49    +11   
==========================================
+ Hits            227        256    +29   
- Misses           11         17     +6   
- Partials         11         17     +6   

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[fafhrd91]

thanks!

[argaen]

Np! I'll create a new PR increasing coverage or trying to merge repeated code this weekend if I have time :)

[fafhrd91]

you should get invitation to aiomcache team, it has write access to aiomcache repo

[argaen]

Got it and accepted, thanks :)

[fafhrd91]

Let's make another release after your changes to coverage.