Update CHANGES and bump version

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

CHANGES

@@ -1,3 +1,7 @@
+4.0.4 2017-06-01
+- Save user wininet settings as user-wininet.json
+- Improve performance of aes-256-gcm
+
 4.0.2 2017-05-19
 - Fix legacy key derivation
 - Bug fixes and improvements

shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -24,7 +24,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.0.2";
+        public const string Version = "4.0.4";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {