Merge pull request python-gitlab#705 from python-gitlab/release-1.8.0

Release version 1.8.0

Merge pull request python-gitlab#657 from python-gitlab/release-1.7.0

Prepare the 1.7.0 release

1.6.0 release

1.5.1 release

Prepare the 1.5.0 release

ChangeLog: fix link

Prepare the 1.3.0 release

Prepare v1.2.0

1.1.0 release

Prepare the 1.0.2 release