Bump version: 2.1.10 → 2.1.11
Bump version: 2.1.9 → 2.1.10
Bump version: 2.1.8 → 2.1.9
Bump version: 2.1.7 → 2.1.8
Bump version: 2.1.6 → 2.1.7
Have to add this tag otherwise pypi doesn't allow to reupload the release.