A little typo in blackhc.mdp.example

[fatfingererr]

Hi ! Thank you for this work !

I came to here because your arXiv paper.

And I found a little typo in blackhc.mdp.example.

MULTI_ROUND_NDMP = _multi_round_nmdp()

Just need to change like

MULTI_ROUND_NMDP = _multi_round_nmdp()

Then your example code in Gym environment could be executed.

Sorry I am totally newbie in GitHub and I am learning how to create "Pull requests" now....

I hope I haven' t inconvenienced you !