Update to Xcode 10.2 and Swift 5.0

[taher-mosbah]

Run the migration assistant on framework and test apps, tests are green and 0 warnings.

[taher-mosbah]

Will update CI script as soon as Xcode 10.2 is available.

[k0nserv]

Thanks a bunch @taher-mosbah

[k0nserv]

Hey @taher-mosbah CI still seems to have issues here. Do you want to continue looking at it or should I pick it up?

[taher-mosbah]

Hey @k0nserv I won't have much time coming days, feel free to pick it up, really sorry for that.

[dejanskledar]

Any updates on this?

[adamszeptycki]

Any plans to merge it?

[k0nserv]

Hey, I don't have time to work on this, but I am happy to merge it if someone can create a PR that passes CI, specifically that still works for Swift 3.1 which seems broken in this PR

[k0nserv]

I've released version 3.7.0 which specifies the swift_versions attribute in the podspec. This should mean that you can use SkyFloatingLabelTextField in your Swift 5 projects before someone gets the time to look at and finish this PR

[k0nserv]

Closed in favour of #290