Add set functionality

[danrobinson88]

No description provided.

[codecov-commenter]

Codecov Report

Merging #32 (3eed892) into master (7b77d3f) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   96.28%   96.33%   +0.05%     
==========================================
  Files           7        7              
  Lines         269      273       +4     
  Branches       26       26              
==========================================
+ Hits          259      263       +4     
  Misses          8        8              
  Partials        2        2              

Impacted Files	Coverage Δ
aiodogstatsd/protocol.py	100.00% <ø> (ø)
aiodogstatsd/client.py	92.90% <100.00%> (+0.10%)	⬆️
aiodogstatsd/typedefs.py	100.00% <100.00%> (ø)

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[danrobinson88]

Closes #33