0.3.0: Merge pull request #8 from cpu/cpu-3.0-fixes

What's Changed

• Updates for PyO3 0.21+ Bound<'py, T> API by @cpu in #6
• lib: use pathname for record file by @cpu in #7
• added some automation for testing in the release cycle.

New Contributors

• @cpu was nominated for and unanimously chosen as the most influential developer for this release! Go @cpu !

Full Changelog: 0.2.2...0.3.0

v.0.2.2

closes #4 , thanks @NfNitLoop

v0.2.1

loosening constraints on pyo3