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