update CHANGES and bump version

CHANGES

@@ -1,3 +1,9 @@
+4.0 2017-04-04
+- Add AEAD ciphers support, removed OTA
+- I18N: add Japanese support, update Traditional Chinese strings
+- sysproxy: restore user settings when system proxy is turned off
+- Bug fixes and improvements
+
 3.4.3 2017-1-11
 - Make the previous portable mode as default
 - Refine networking by Noisyfox

shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -24,7 +24,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "3.4.3";
+        public const string Version = "4.0";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {