Specify GitHub in the manifest

[paulmolluzzo]

This doesn't change the behavior of the extension, but makes sure that the extension only gets loaded into GitHub pages. You could probably messageIfFound() function in the inject.js file since this ensures it's only a Github page, but I didn't go that far.

[DrewML]

I initially had gone this route (restricting to just the GitHub.com domain), but realized it would be limiting anyone that wanted to use this for GH Enterprise.

I'll look a bit more into dynamic permissions for Chrome extensions, to see if I can just add an option for users to add their own hostname. I definitely don't like having to request access to all pages, but last time I checked, dynamic host permissions were pretty limited.

P.S. Thanks for contributing!

[sindresorhus]

@DrewML Notifier for GitHub handles GitHub Enterprise in an option. You could look at how it does it: https://github.com/sindresorhus/notifier-for-github-chrome/blob/7d3edf98510c382735f3ece5e2ae58d4f9e38472/extension/options.html#L26-L29

[DrewML]

Perfect! Thanks for the heads-up.

[jungletian]