Revert #209

[Roach]

Summary

Revert #209

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #212 into master will increase coverage by 0.07%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   61.76%   61.84%   +0.07%     
==========================================
  Files           9        9              
  Lines         306      304       -2     
  Branches       57       56       -1     
==========================================
- Hits          189      188       -1     
+ Misses        103      102       -1     
  Partials       14       14

Impacted Files	Coverage Δ
slackclient/server.py	61.86% <37.5%> (+0.19%)	⬆️
slackclient/client.py	38.88% <50%> (ø)	⬆️

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