v3.0.0 / v3.0.1

Release of PZFlow 3.0.0 (the 0.0.1 was just to fix the README on PyPI and doesn't reflect any changes to the code)

Changes

• Made Uniform the default distribution
• Made all distributions symmetric about zero
• Moved to Optax for optimization
• Added default bijectors to Flow and FlowEnsemble.

Features

• Added early stopping to train methods
• Added progress bar to train methods
• Added CentBeta13 distribution, which looks like a Guassian with hard cutoffs.

Bugs

• Fixed bug where FlowEnsemble metadata was not available from the ensemble itself, only from the individual flows in the esemble