Update master to Swift 3.0

[AYastrebov]

Hi! Nice framework!
Is there any plans on migrating master branch to swift 3?
Thank you!

[tadija]

Hi, thanks!
There are plans for sure, it's just not quite finished yet, so that's why it's still not merged.
I'll leave this issue open until it's done.

[tawrahim]

Any updates on this?

[letlet]

Nice framework
How is it going with Swift 3?

[sicaboy]

How is it going with Swift 5?