Update carthage stanza in README
Update carthage stanza in README

Carthage cannot parse `'`. It also requires the username/organization that the repo can be found in.

ernestopino/Nuke,alessandrostone/Nuke,RuiAAPeres/Nuke,RuiAAPeres/Nuke,MaddTheSane/Nuke,kean/Nuke,MaddTheSane/Nuke,RuiAAPeres/Nuke,gaurav1981/Nuke,ernestopino/Nuke,kean/Nuke,MaddTheSane/Nuke,gaurav1981/Nuke,alessandrostone/Nuke