Updated web-api dependency to 5.6.0. #334

[stevengill]

Summary

#334, updated web-api dependency to 5.6.0. This way when folks update their bolt dependency, they will get the newer web-api which includes support for granular bot permissions.

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 #335 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #335   +/-   ##
=======================================
  Coverage   73.71%   73.71%           
=======================================
  Files           7        7           
  Lines         506      506           
  Branches      145      145           
=======================================
  Hits          373      373           
  Misses        101      101           
  Partials       32       32

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