Slack-bot commit link broken if commit has body as well as title

[SoylentGraham]

This gets output

<https://github.com/condensereality/Live-Event-App/commit/8fd06bb1a708537e45b14511420daa7195791922|Updated error display to show error codes  (#108)
* Updated error display to show error codes instead of raw error messages
* Fixed background image on error message>

We should be

• stripping line feeds (and any other symbols slack bot doesnt like)
• Using just the commit title, not the body