modify line 139 in optim.py

[bessembhiri]

i just changed the line #rstate=np.random.RandomState(rseed),

by rstate=np.random.default_rng(rseed), to allow compatibility with hyperopt==0.2.7

[phenomax]

+1: This patch got it working for me with hyperopt==0.2.7

[embengnoob]

confirming that this patch worked for me too: hyperopt==0.2.7, won't compile otherwise