Add Swift 4.2/iOS 12/macOS Mojave 10.14 info to readme

readme.md

@@ -8,20 +8,26 @@ Handle is an easy-to-use, expressive Swift library for handling notifications.
 
 ### 1. Update your Cartfile
 
-**Swift 3 (master branch)**
-
-(As of version 5.0, Handle is safe to use in App Extensions.)
+**Swift 4.2/iOS 12/macOS Mojave (10.14)**
 
 ```
-git "git@source.ind.ie:project/handle.git" ~> 5.0
+git "git@source.ind.ie:project/handle.git" ~> 6.0
 ```
 
-**For Swift 4 (Xcode 9 Beta):**
+**Swift 4 (Xcode 9.x):**
 
 ```
 git "git@source.ind.ie:project/handle.git" "swift-4"
 ```
 
+**Swift 3 (master branch)**
+
+(As of version 5.0, Handle is safe to use in App Extensions.)
+
+```
+git "git@source.ind.ie:project/handle.git" ~> 5.0
+```
+
 ### 2. Add the framework to your Xcode project
 
 [Follow the instructions on Carthage’s readme](https://github.com/Carthage/Carthage#adding-frameworks-to-an-application).