v2.0.0

Changes & new features for discrete Thompson sampling:

• signature of sample_batch changed:
  • samples must be passed as (C, S) or (C, ?) instead of (S, C). This is to permit unequal sample sizes.
  • a new kwarg correlated:bool must be specified to choose between jointly or independently sampling from the candidate posterior samples
• brute-force probability calculation get_probabilities is replaced with sampling_probabilities that calculates the Thompson sampling probability for each candidate exactly.