Support for Dirichlet distribution

[rohitjoshi]

It would be helpful if we can add support for Dirichlet distribution. I am currently using crate statrs for Dirichlet and rand for another type of distribution.

Here is numpy implementation: https://github.com/numpy/numpy/blob/master/numpy/random/mtrand/mtrand.pyx#L4723

[dhardy]

Good call, but also see #290.

In any case, adding new distributions is not a focus right now, but PRs will be considered.

[pitdicker]

@rohitjoshi Would you be interested in making a PR?

[rohitjoshi]

Sure, I implemented in my project. Will submit a PR.

[pitdicker]

Now that Rand 0.5 is out the door, can I give you a small reminder? No obligations of course.

[rohitjoshi]

@pitdicker will submit PR this weekend. Thank you.