make a new 2.3.6 release
switch to pyproject.toml and make a new version
Bump version to 2.3.4
bumped the version to 2.3.1
bumped the version to 2.3
bumped the version to 2.2.2
released 2.2.1
version 2.2
bumped the version to 2.1.1
bumped to version 2.1 and updated changelog