Changelog of @hackage/mwc-probability 2.2.0

# Changelog

- 2.2.0 (2020-01-29)
* Adds the Chinese Restaurant Process (crp).

- 2.1.0 (2019-07-23)
* Generalises 'categorical' and 'multinomial' to take things proportional to
  probabilities, rather than probabilities proper.

- 2.0.4 (2018-06-30)
* Clean up docs and add some additional usage information.
* Split the existing Student t distribution into 'student' and its
  generalised variant, 'gstudent'.

- 2.0.3 (2018-05-09)
* Add inverse Gaussian (Wald) distribution

- 2.0.2 (2018-01-30)
* Add negative binomial distribution

- 2.0.1 (2018-01-30)
* Add Normal-Gamma and Pareto distributions

- 2.0.0 (2018-01-29)
* Add Laplace and Zipf-Mandelbrot distribution
* Rename `isoGauss` to `isoNormal` and `standard` to `standardNormal` to
  uniform naming scheme.
* Divide Haddock in sections

- 1.3.0 (2016-12-04)
* Generalize a couple of samplers to use Traversable rather than lists.