Separates out the GitHub and GitHub api

[orta]

This isn't exactly perfect, but I dropped a feature that I think may still be needed for Peril to migrate to the latest Danger - so I'm going to re-add it, and cover it with tests :D

• Add some more tests to the GitHubAPI
• Add support for additional headers to the API object

[DangerCI]

	Warnings
⚠️	Changes were made to package.json, but not to yarn.lock - Perhaps you need to run `yarn install`?

Generated by 🚫 dangerJS

[codecov-io]

Codecov Report

Merging #136 into master will not impact coverage.

@@          Coverage Diff          @@
##           master   #136   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files           3      3           
  Lines          90     92    +2     
  Branches       16     16           
=====================================
- Misses         90     92    +2

Impacted Files	Coverage Δ
source/commands/danger-pr.ts	0% <ø> (ø)	✅

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[orta]

OK, this should be good for review - glad we got so much infra to tell me I'm doing things wrong :D

[orta]

Alright, doing this 👍

[macklinu]

Thanks for cleaning this up @orta 👍