added oauth package to bolt

[stevengill]

Summary

Issue: #478

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

❗ No coverage uploaded for pull request base (master@a86a30a). Click here to learn what that means.
The diff coverage is 71.69%.

@@            Coverage Diff            @@
##             master     #479   +/-   ##
=========================================
  Coverage          ?   82.99%           
=========================================
  Files             ?        7           
  Lines             ?      594           
  Branches          ?      186           
=========================================
  Hits              ?      493           
  Misses            ?       68           
  Partials          ?       33           

Impacted Files	Coverage Δ
src/ExpressReceiver.ts	65.21% <67.85%> (ø)
src/App.ts	87.44% <75.00%> (ø)
src/helpers.ts	90.90% <100.00%> (ø)
src/middleware/process.ts	100.00% <0.00%> (ø)
src/errors.ts	100.00% <0.00%> (ø)
src/middleware/builtin.ts	82.78% <0.00%> (ø)
src/conversation-store.ts	100.00% <0.00%> (ø)

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[stevengill]

Thanks for reviewing this with me today @aoberoi! Merging it in