Updated examples to avoid dataset loading problems with sklean 0.25

[JoseLlorensRipolles]

I've updated the dataset loading to avoid sklearn0.25 problems and fix the warning explained at #254

The code for the docs have the same issue but running them again produces different results (non-realted with dataset loading) from the actual docs, I guess because of library changes, so I haven't changed the docs. One example would be different model architecture printouts. Let me know if you wouldn't mind regenerating them.

Thank you in advance and thank you for the awesome package!

[ryan-wolbeck]

re-running the jobs to check if a linter issue is present, if all comes back clear there I'll merge

[ryan-wolbeck]

@JoseLlorensRipolles fyi to run the linter to fix formatting issues just run 'make lint'