Merge pull request MongoEngine#2637 from bagerard/prepare_0_24_1

Prepare release 0 24 1

Merge pull request MongoEngine#2623 from bagerard/prepare_release_0_24_0

Prepare release 0 24 0

Merge pull request MongoEngine#2513 from bagerard/prepare_release

Prepare release

Merge pull request MongoEngine#2487 from bagerard/prepare_0_23_0

update changelog for 0.23.0 release

Merge pull request MongoEngine#2453 from bagerard/prepare_0_22_1

Update changelog for 0.22.1

Merge pull request MongoEngine#2447 from bagerard/_changelog_0_22_0

prepare 0.22.0

Merge pull request MongoEngine#2424 from bagerard/bump_0_21_0

Prepare 0.21.0 release

Merge pull request MongoEngine#2319 from bagerard/prepare_0_20_0

Bump version to 0.20.0 and update CHANGELOG accordingly

Merge pull request MongoEngine#2233 from bagerard/release_0_19_1

Bump version to 0.19.1 + force pillow to be < 7.0.0

fix pypi deployment version match