v0.1.0: An initial "release"

While the README still includes a "WIP" note, we've been using roughly this version of Relude in production for several months. It works reasonably well, but there are known inconsistencies in function names and signatures.

We plan to begin addressing several open issues that will lead to breaking API changes (generally with easy migration paths). In order to properly document those breaking changes, we need to be able to compare the API with some previous point in time. This 0.1.0 release marks that point in time.