Classification.confidence as a float not a list

[mkozakov]

Before:

res = co.classify(...)
res.classifications[0].confidence # [ Confidence(label: __, confidence: 0.8), Confidence(label: __, confidence: ___), ...)

After

res = co.classify(...)
res.classifications[0].confidence # 0.8

[lfayoux]

@mkozakov How do you feel about changing the return type of classify to Classifications to List[Classification]. So instead of

res = co.classify(...)
res.classifications[0].confidence # 0.8

It would be

res = co.classify(...)
res[0].confidence # 0.8

[mkozakov]

I feel great about it - Aidan already has this change in PR