Update README.md

Author: Luc Dion

README.md

@@ -35,7 +35,7 @@ Extremely Fast views layouting without auto layout. No magic, pure code, full co
 ### Requirements
 * iOS 8.0+ / tvOS 9.0+ / macOS 10.9+
 * Xcode 8.0+ / Xcode 9.0+
-* Swift 3.2+ / Swift 4.0 / Objective-C
+* Swift 3.2+ / Swift 4.1 / Objective-C
 
 ### Recent changes/features
 * :star: PinLayout can now layout CALayer. See [CALayer Support](#calayer_support) for more information.