set version using `setuptools_scm`
- bump version to 0.6.0
- add GitHub action to automatically bump patch version on merge of PRs
@vloncar @thesps opening this PR for discussion on how to handle automatic version bumping
My thought is it to have a GitHub action to automatically bump patch version on merge of PRs (unless PR has [MINOR] or [MAJOR] in the comment, then we bump the minor or major version as well)