Release highlights:

- Hound will now write the older WAVEFORMATEX format whenever possible,
  rather than the newer WAVEFORMATEXTENSIBLE, to improve compatibility.
- Certain nonstandard files (produced among others by "Pro Tools") can
  now be read.
- Ensures compatibility with Rust 1.4 through 1.21 stable.

Many thanks to Denis Kolodin for contributing to this release.