Add support for Swift 5.0

[AlbertArredondoAlfaro]

Hi guys,

Are you planning to add support for Swift 5.0 ?

I've tested to recompile the framework using Swift 5.0 and no issues arise, so you only need to recompile it and that's all.

Best regards,

Albert Arredondo

[AlbertArredondoAlfaro]

I have opened a new pull request: #220