include branch field in update_file()
Merge pull request #173 from tpetr/update-file-branch

include branch field in update_file()
Add @esacteksab as a maintainer in AUTHORS.rst
Ack @tpetr's fix in HISTORY.rst
Start testing against multiple requests versions
Fix .travis.yml
Fixes #129

Add GitHub#rate_limit
Add rate_limit to public API
Add integration test for GitHub#rate_limit

- Also add cassette
Add test around github3.rate_limit()
Make test future proof
Fix the ratelimit_remaining property
Replace old test with new integration test
Fix doc-strings
Must keep HISTORY up-to-date
Note which version rate_limit was added in

[ci skip]