Fix GetProjectCard argument name (google#1239)

Use time.Until (google#1233)

Add support for creating and using template repos (google#1236)

Fixes google#1235.

Fix ineffectual assignments and error handling in tests (google#1234)

Bump version to v27

Add methods for GitHub Enterprise endpoints (google#1214)

Add repository creation permissions field (google#1213)

Added Support preview Team Sync API for GitHub Enterprise Cloud users (…

…google#1212)

Fixes google#1200.

Consistent errors for GetRef when a Ref doesn't exist (google#1207)

Fixes google#1208.

Add Visibility to UserEmail (google#1215)