Last commit only bumped the dev dependencies :(

Bumped betterproto version to 2.0.0b3

Various

* replace setuptools with poetry
* reworked protobuf download/compile
* a test is now fixed

Signed-off-by: Vasili Syrakis <[email protected]>

Merge pull request cetanu#8 from cetanu/0.2.0

0.2.0