Removed response serializer validate call

[ynechaev]

This method was not implemented so caused a compiler error

[steipete]

Didn't someone else just add this PR? I'm just using NSURLSession so not really maintaining this anymore.

[ynechaev]

@steipete what do you mean under PR, can you clarify please?) So, do you recommend to avoid using this component due to lack of support any more?

[steipete]

It still works - I just generally recommend to use NSURLSession unless you need iOS 5/6 support.

[ynechaev]

@steipete I use ios 7+ deployment target, so thank you for the advice. I think I will migrate to NSURLSession.