Bump version: 1.6.4 → 1.6.5

Bump version: 1.6.3 → 1.6.4

Merge pull request #296 from jpweytjens/min_python_version

Sphinx only supports python 3.5+

Merge pull request #292 from jpweytjens/update_requirements

update requirements

Bump version: 1.6.0 → 1.6.1

Bump version: 1.5.0 → 1.6.0

bump version number

docs cleanup

bump to version 1.3.0

bump in version to 1.2.0