Add Swift support (.swift)
Add Swift support (.swift)

Pygments has support for SwiftLexer but not in released versions right now.
When it does, we will be ready for it.

JoshuaToenyes/groc,erdii/groc,nevir/groc,andrewburgess/groc,JoshuaToenyes/groc,andrewburgess/groc,andrewburgess/groc,nevir/groc,JoshuaToenyes/groc,erdii/groc,erdii/groc,nevir/groc,andrewburgess/groc,erdii/groc,JoshuaToenyes/groc