Resolves#192
Also avoids the unqualified import on `GitHub` in GH.hs, since this lib's types
are already complex/confusing enough without the ambiguity!
We now have the bot:
1. Doing the automated upgrade (bump version, src, recomputing hash)
2. Doing a full nixpkgs-review reverse closure rebuild
The next step for a human is to review the upstream changelog. Right now they
have to find it manually, but if `meta.changelog` is set, this commit adds a
link to it directly in the PR description .
Resolves#44
We're no longer running this on `staging` PRs, and users doing single-package
updates have the option to omit `nixpkgs-review`, so we should only include the
PR comment section if it was actually run.
This continues to enhance the automated tests for the PR comment formatting,
so you can see what the diff looks like just by looking at the test suite!
Having the tests makes it easier to visualize what's going on, because we can
just look at the test output data. This is not foolproof, since one of the IO
helper functions could generate bad data to pass to the pure helper, but it's
better than nothing.
This refactors as much as possible to keep the PR description logic in the pure
`prComment` function, rather than computing it in multiple places, which also
increases out unit test coverage.
