Update CHANGES and bump version

CHANGES

@@ -1,3 +1,7 @@
+4.1.2 2018-09-13
+- Fix plugin CLI argument environment variable issue (#1969 #1818)
+- Other minor bug fixes and improvements (#1978 #1968 #1993)
+
 4.1.1 2018-08-18
 - Fix auto hotkey reg issue when OS wakeup
 - Other minor 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 = "4.1.1";
+        public const string Version = "4.1.2";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {