v0.8.1

It's very important that you update to this version, before this one, album creation was duplicating items. See #19 for more details.

Changelog

3b8ccfa Add auth documentation (#124)
9ccd822 Add badges for Codebeat and Coveralls (#121)
39621fc Add codecov as coverage report service (#122)
76225af fix: Set golang 1.12 to release images, latest 1.13 was not working well
2a5e25a tests: Add more tests to config