Bump version to 0.54.2

Bump version to 0.54.1

Bump version to 0.54.0

Bump version to 0.53.0

Bump version to 0.52.1

Bump version to 0.52.0

Bump version to 0.51.0

Bump version to 0.50.0

What a terrible experience... I have recovered the project from a broken state...

Bump version to 0.49.4

0.49.3 was a serious mistake, so we dropped it.

Bump version to 0.49.2