Update CHANGES and bump version

CHANGES

@@ -1,3 +1,9 @@
+4.0.9 2018-03-14
+- Fix port occupied issue
+- Add xchacha20-ietf-poly1305
+- Update cryptographic libraries
+- Bug fixes and improvements
+
 4.0.8 2018-02-16
 - Add OpenSSL 1.1.0g support #1671
 - Update nuget packages

shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -24,7 +24,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.0.8";
+        public const string Version = "4.0.9";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {