What's Changed
* Spectrogram can be saved to file by santiagobarreda in https://github.com/FastTrackiverse/fasttrackpy/pull/58
* Candidate track objects can be pickled and unpickpled by santiagobarreda in https://github.com/FastTrackiverse/fasttrackpy/pull/58
**Full Changelog**: https://github.com/FastTrackiverse/fasttrackpy/compare/v0.3.2...v0.3.3