Breaking Changes
* The `Pedalboard` constructor no longer supports the `sample_rate` parameter.
What's Changed
* Allow `Pedalboard` objects to be used as plugins (i.e. nesting) (https://github.com/spotify/pedalboard/pull/68)
* Added `Mix` plugin to allow parallel processing (i.e.: buses) (https://github.com/spotify/pedalboard/pull/68)
* Added `Invert`, `Resample`, and `GSMFullRateCompressor` plugins (https://github.com/spotify/pedalboard/pull/70, https://github.com/spotify/pedalboard/pull/75, https://github.com/spotify/pedalboard/pull/72)
* Prevented memory leaks if invalid parameters are passed to plugin constructors (https://github.com/spotify/pedalboard/pull/73)
* Fixed boundary effects before (and after) some pitch shift operations (https://github.com/spotify/pedalboard/pull/74)
**Full Changelog**: https://github.com/spotify/pedalboard/compare/v0.3.14...v0.4.0