Updated podspec file to specify Swift 4.2 as required by changes made

SunnyApp / flutter_contact

A flutter plugin for retrieving, creating, saving, and watching contacts on native devices

BSD 3-Clause "New" or "Revised" License

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Closed tkeithblack closed 4 years ago

tkeithblack commented 4 years ago

ContactFormsHandler.swift and others were receiving the following error:

UIKit.UIActivityIndicatorView:6:12: note: 'init(style:)' was introduced in Swift 4.2 public init(style: UIActivityIndicatorViewStyle)

This pull request updates the flutter_contact.podspec file to specify Swift 4.2.