New version 4.0 to surpport Swift 4 and 5

CLTypingLabel.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "CLTypingLabel"
-  s.version          = "0.3.0"
+  s.version          = "0.4.0"
   s.summary          = "UILabel with character by character typing animation in swift iOS/OSX"
 
 # This description is used to generate tags and improve search results.
@@ -19,15 +19,15 @@ Pod::Spec.new do |s|
   s.description      = "iOS/OSX UILabel with character by character typewriter like animation"
 
   s.homepage         = "https://github.com/cl7/CLTypingLabel"
-  # s.screenshots     = "https://raw.githubusercontent.com/l800891/CLTypingLabel/master/Files/demogiff.gif"
+  # s.screenshots     = "https://raw.githubusercontent.com/cl7/CLTypingLabel/master/Files/demogiff.gif"
   s.license          = 'MIT'
   s.author           = { "Chenglin" => "[email protected]" }
   s.source           = { :git => "https://github.com/cl7/CLTypingLabel.git", :tag => s.version.to_s }
   # s.social_media_url = 'https://twitter.com/<TWITTER_USERNAME>'
 
-  s.platform     = :ios, '9.0'
+  s.platform     = :ios, '10.0'
   s.requires_arc = true
-
+  s.swift_versions = ['4.0', '5.0']
   s.source_files = 'Pod/Classes/*'
 
 

Pod/Classes/CLTypingLabel.swift

@@ -56,7 +56,7 @@ import UIKit
     private var typingStopped: Bool = false
     private var typingOver: Bool = true
     private var stoppedSubstring: String?
-    private var attributes: [NSAttributedStringKey: Any]?
+    private var attributes: [NSAttributedString.Key: Any]?
     private var currentDispatchID: Int = 320
     private let dispatchSerialQ = DispatchQueue(label: "CLTypingLableQueue")
     /*
@@ -139,7 +139,7 @@ import UIKit
     // MARK: -
     // MARK: Set Text Typing Recursive Loop
 
-    private func setTextWithTypingAnimation(_ typedText: String, _ attributes: Dictionary<NSAttributedStringKey, Any>?, _ charInterval: TimeInterval, _ initial: Bool, _ dispatchID: Int) {
+    private func setTextWithTypingAnimation(_ typedText: String, _ attributes: Dictionary<NSAttributedString.Key, Any>?, _ charInterval: TimeInterval, _ initial: Bool, _ dispatchID: Int) {
 
         guard !typedText.isEmpty && currentDispatchID == dispatchID else {
             typingOver = true