Typo in de.py

[cypark0411]

Your codes are very helpful to solve my projects.

While I applied your code, I found a typo that you might know already.

Typo part:
de.py -> class DE -> def solve

'return' might be changed as follows:

Original code:
return self.denormalize(P[idx].reshape(-1, 1)), fitness[idx]

Fixed:
return self.denormalize(P[idx].reshape(1, -1)), fitness[idx]

[pablormier]

Fixed in v1.1.0. Thanks!