Use shutdown() to exit on success.

[davidlehn]

Depends on digitalbazaar/bedrock#111.

[davidlehn]

This was written quite a while ago. It was working for the use case I had. It really could use more testing before a release.
I suspect it will work fine in most cases but would be good to check. It's possible the handlers that were never called before, which now will be, could cause edge case issues.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.09%. Comparing base (43b6a98) to head (4157187).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   88.09%   88.09%           
=======================================
  Files           4        4           
  Lines         336      336           
=======================================
  Hits          296      296           
  Misses         40       40           

Files with missing lines	Coverage Δ
lib/test.js	85.51% <100.00%> (ø)

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