🤦 Fixing issues around Oauth and SlackApiErrors

[RodneyU215]

Summary

Fixing #481 by properly passing oauth params with aiohttp.BasicAuth.

Fixing #436 by returning the entire SlackResponse in SlackApiError's.

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 #527 into master will decrease coverage by 0.02%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
- Coverage   68.98%   68.96%   -0.03%     
==========================================
  Files          15       15              
  Lines        1709     1711       +2     
  Branches       96       97       +1     
==========================================
+ Hits         1179     1180       +1     
  Misses        507      507              
- Partials       23       24       +1

Impacted Files	Coverage Δ
slack/errors.py	100% <ø> (ø)	⬆️
slack/web/client.py	33.61% <0%> (ø)	⬆️
slack/web/slack_response.py	100% <100%> (+2.22%)	⬆️
slack/web/base_client.py	79.61% <33.33%> (-1.58%)	⬇️

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[RodneyU215]

@seratch can you take a look at these fixes?

[seratch]

Both look good to me. 👍

[tyndyll]

Will this be merged soon? This blocks all OAuth access via the SDK

[RodneyU215]

Thanks @seratch!

@tyndyll I'll work on getting a patch release out today for this.