Support type literals

[ssobhy]

i tried to install it on xcode 9.1 and it is not working

[Bouke]

It's working just fine on 9.1. See the known limitations listed in the readme:

It will only parse attributes defined like (open|public|fileprivate|private|internal) [weak] (var|let) NAME: TYPE.

You didn't specify the types, but are using String literals. This is not supported, but would be cool to have.