Set Carthage Swift version to 4.2 (Swift 4 + 5 compatibility) #47
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Description
Update the Swift version to 4.2 in the Carthage support Xcode project
Motivation and Context
The current Xcode project specifies Swift 3. This will be incompatible with Swift 5 being released shortly in Xcode 10.2.
By specifying Swift 4.2, swift-html-entities will be compatible with both Swift 4.2 and Swift 5.
How Has This Been Tested?
Carthage build using Xcode 10.1 and Xcode 10.2 beta 3 as the set toolchains.
After reading below I will get a CLA form signed shortly!
Checklist: