Merge pull request #419 from MongoEngine/travis-update

Travis updated to use focal ubuntu images

Bump version to 0.9.5

Bump version to 0.9.4

Bump version to 0.9.3

version bump

extra info in the changelog [ci skip]

bump version to v0.9.0 now that py26 is not supported anymore

version 0.8.2 + rely on six and not mongoengine.python_support

Bump version to 0.8.1

Version 0.8 candidate