v0.9.5

Added Exponential Backoff attempts to get_tracks. Retrieving tracks will now by default retry on failure up to a maximum of 5 attempts with an Exponential Backoff.
You can set this to False with the kwarg retry_on_failure=False, which will only attempt to retrieve tracks once.

Added support for custom JSON Encoders.

Changed YouTube's Track Image to hqdefault, in place of maxresdefault.