Update CHANGES and bump version

CHANGES

@@ -1,3 +1,8 @@
+4.0.8 2018-02-16
+- Add OpenSSL 1.1.0g support #1671
+- Update nuget packages
+- Bug fixes and improvements
+
 4.0.7 2017-12-09
 - Fix QR code and ss:// protocol import issue
 - Add an option to show password

shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -24,7 +24,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.0.7";
+        public const string Version = "4.0.8";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {