Update README.md

OskarGroth · Aug 5, 2018 · be0bd02 · be0bd02
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@@ -19,6 +19,8 @@ Configure your Cartfile to use `OGSwitch`:
 
 ```github "OskarGroth/OGSwitch" ~> 2.0```
 
+`OGSwitch` requires Swift 4.2.
+
 ## Usage
 
 Create a custom `NSView` in Interface Builder and set it's class to `OGSwitch`.