DE Optimiser return syntax is deprecated

[drpriscu]

Dear @Neeratyoy, please see the log from running the DE optimiser:

/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/dehb/optimizers/de.py:810: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray.
return np.array(self.traj), np.array(self.runtime), np.array(self.history)

[Neeratyoy]

Hi
Would you like to create a PR with this change?

return np.array(self.traj), np.array(self.runtime), np.array(self.history, dtype=object)

This should remove the warning.
If not, of course, I can update this too.

[drpriscu]

Please could you?

[Neeratyoy]

Let me know if this is making DEHB unusable and blocking your work. I'll prioritize this a bit more and get it done sooner.

[drpriscu]

Only appears when running the DE optimiser; may prevent retrieving results.

[Neeratyoy]

Thanks for the issue.
This has been updated in the v0.0.5 PyPi release of dehb.