Lint rule for ensuring `set -euo pipefail` or similar is set

[a-frantz]

Upgrading discussion #60 to an issue for visibility.

Repeating myself, but I would think there's an "off the shelf" solution we can pull for this. It might involve shelling out, but I think that would be ok. I just don't want us to get in the business of writing a Bash parser 😬