Bump version: 0.6.1-dev → 0.6.1

update version to 0.6.0

remove brittle python3 tests. grr. python3

update CHANGELOG

bump version; update changelog

bump version; update changelog

update change log; bump version to v0.4.0

update changelog; bump version to 0.3.20

update change log; bump version

bump version; update changelog