Release v0.3.1

Bump build system

Release v0.3.0

Run tests on python 3.9 (#19)

This also requires being more specific about compatible python versions for poetry (arguably a bug in poetry).

I've also moved to a simpler installation method for poetry.

#minor

Release v0.2.4

Version 0.2.4

Release v0.2.3

Version 0.2.3

Release v0.2.2

Version 0.2.2

Release v0.2.1

Version 0.2.1

Release v0.2.0

Version 0.2.0

Release v0.1.16

Version 0.1.16

Release v0.1.15

Version 0.1.15

Release v0.1.14

Version 0.1.14