v0.3.1

This is the latest release that uses ndarray::ArrayView1 as underlying and mandatory interface. In future releases, we will switch to using slices internally and offer optional compatibility with other data types, including ndarray::ArrayView1

_{P.S.: This release and tag were created after we had already implemented slices as the internal interface. The tag references the latest commit that includes the ndarray::ArrayView1 implementation, which corresponds to v0.3.1 of the Rust crate.}