Adds information about SwiftLint plugin for AppCode into README.md
Adds information about SwiftLint plugin for AppCode into README.md

realm/SwiftLint,firebase/SwiftLint,victorpimentel/SwiftLint,realm/SwiftLint,jeffreybergier/SwiftLint,victorpimentel/SwiftLint,victorpimentel/SwiftLint,Johnykutty/SwiftLint,lyft/SwiftLint,lyft/SwiftLint,firebase/SwiftLint,realm/SwiftLint,jeffreybergier/SwiftLint,jeffreybergier/SwiftLint,victorpimentel/SwiftLint,realm/SwiftLint,firebase/SwiftLint,lyft/SwiftLint,Johnykutty/SwiftLint,jeffreybergier/SwiftLint,Johnykutty/SwiftLint,firebase/SwiftLint,lyft/SwiftLint,Johnykutty/SwiftLint