This is a minor release in the 0.* series.
It includes join functionality for `pandas.DataFrames` and `pandas.Series` which have `pandas.IntervalIndex`, and an extension of `pandas.IntervalIndex.contains` to one which accepts multiple values. Execution speed for lookup-related functionality released in v0.4.0 has been significantly sped up.
See [release notes](https://piso.readthedocs.io/en/latest/release_notes/index.html) for details