update Travis image to Xcode 8.2
update Travis image to Xcode 8.2

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