Dictionary+ContentsOf.swift

import Foundation
extension Dictionary {
    static func contentsOf(url: URL) -> Dictionary<Key, Value>? {
        do {
            let data = try Data(contentsOf:url)
            let properties = try PropertyListSerialization.propertyList(from: data, options: [], format: nil) as? [Key: Value]
            return properties
        } catch {
            return nil
        }
    }
}