Webhook notifications

[circa10a]

Closes #61

[codecov-io]

Codecov Report

Merging #71 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #71   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           8      9    +1     
  Lines         169    186   +17     
=====================================
+ Hits          169    186   +17

Impacted Files	Coverage Δ
ouroboros/webhook.py	100% <100%> (ø)
ouroboros/cli.py	100% <100%> (ø)	⬆️
ouroboros/defaults.py	100% <100%> (ø)	⬆️
ouroboros/main.py	100% <100%> (ø)	⬆️

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