Supports to use this framework backward deployable on iOS 12/macOS 10.14-

[dreampiggy]

This close #14

Sample code:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    if #available(iOS 13, *) {
        // iOS 13 use UIWindowScene
        SDImageLoadersManager.shared.addLoader(SDImageLinkLoader.shared)
    } else {
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = ViewController()
        window?.makeKeyAndVisible()
    }
    return true
}

Before :

After:

[codecov[bot]]

Codecov Report

Merging #15 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #15   +/-   ##
=======================================
  Coverage   60.08%   60.08%           
=======================================
  Files           2        2           
  Lines         223      223           
=======================================
  Hits          134      134           
  Misses         89       89

Flag	Coverage Δ
#iOS	60.08% <ø> (ø)	:arrow_up:

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