SPM Support

Add support for SPM.

Xcode 12

• Update project settings for Xcode 12

5.6.0

• Configurable window level. Thanks @kevin-kp for the addition

Swift 5 Support

5.5.0

Update to Swift 5

5.4.2

• Fix status bar alignment for iOS 10. Thanks @okanerdogan09

Rename license file

Fixes typo in the file name

Custom Accessory View

• Adds support for a custom accessory view via #26 Thanks to @okanerdogan09

Swift 4.2

Merge pull request #25 from JanGorman/swift/4.2

Swift/4.2

5.2.2

• Another force unwrapped keyWindow removed

5.2.1

• Removed force unwrap of keyWindow. Thanks @Igor-Palaguta