Support GitHub Enterprise

[jadutter]

It'd be nice if this could also check the notifications for GitHub Enterprise.

[maclarel]

Granted I don't have a GHES instance handy to test with at the time of writing this comment, but since this is wrapping gh api (which has support for GHES) my assumption is that this should work as long as you're authed to GHES in the gh CLI and have that account selected 🤔

I'm curious about taking a shot at fixing this if it's not working, so you can you expand on what you're seeing that prompted this issue?

[matawed]

I can confirm that the extension works as expected if you e.g. login to your enterprise host with gh auth login ...

and then run

GH_HOST=enterprise-host.domain gh notify