Minor release improving robustness of parallel sampling and progress bars.
* Now possible to get partial chains sampled so far on manual interrupt when sampling multiple chain in parallel.
* Added in-built progress bar implementation as alternative to tqdm and improving handling of progress bars when sampling chains in parallel by moving progress bar updates to parent process by communicating via a shared queue.
* Added more informative error message when a PicklingError is raised due try to pickle an Autograd generated function using inbuilt multiprocessing module.