add tests for convenience funcs (Get/Post/Put/etc)

[derekperkins]

No description provided.

[codecov]

Codecov Report

Merging #24 into master will increase coverage by 4.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   34.15%   38.61%   +4.46%     
==========================================
  Files           7        7              
  Lines         448      448              
==========================================
+ Hits          153      173      +20     
+ Misses        273      247      -26     
- Partials       22       28       +6

Impacted Files	Coverage Δ
response.go	42.37% <0%> (+3.38%)	⬆️
client.go	54.62% <0%> (+16.66%)	⬆️

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