Update lifecycle handlers (#514)

SkeletonView.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "SkeletonView"
-  s.version      = "1.30.1"
+  s.version      = "1.30.2"
   s.summary      = "An elegant way to show users that something is happening and also prepare them to which contents he is waiting"
   s.description  = <<-DESC
   Today almost all apps have async processes, as API requests, long runing processes, etc. And while the processes are working, usually developers place a loading view to show users that something is going on.

SkeletonViewCore/Sources/Internal/UIKitExtensions/UIView+AppLifecycleNotifications.swift

@@ -22,11 +22,11 @@ extension UIView {
     func startObservingAppLifecycleNotifications() {
         NotificationCenter.default.addObserver(self, selector: #selector(appDidBecomeActive), name: .applicationDidBecomeActiveNotification, object: nil)
         NotificationCenter.default.addObserver(self, selector: #selector(appDidEnterBackground), name: .applicationDidEnterForegroundNotification, object: nil)
-        NotificationCenter.default.addObserver(self, selector: #selector(willTerminateNotification), name: .applicationDidEnterForegroundNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(willTerminateNotification), name: .applicationWillTerminateNotification, object: nil)
     }
     
     func stopObservingAppLifecycleNotications() {
-        NotificationCenter.default.removeObserver(self, name: .applicationDidEnterForegroundNotification, object: nil)
+        NotificationCenter.default.removeObserver(self, name: .applicationDidBecomeActiveNotification, object: nil)
         NotificationCenter.default.removeObserver(self, name: .applicationDidEnterForegroundNotification, object: nil)
         NotificationCenter.default.removeObserver(self, name: .applicationWillTerminateNotification, object: nil)
     }