Update CHANGES and bump version

CHANGES

@@ -1,3 +1,10 @@
+4.1.6 2019-04-17
+- Add http proxy "basic access authentication"
+- Add check box to toggle plugin argument input
+- Add apply button for server configuration form
+- Update UI of switching proxy mode
+- Update exception handler for port assignment
+
 4.1.5 2019-03-08
 - Update nuget packages
 - Update the PAC javascript to support user rules in a better way

shadowsocks-csharp/Controller/Service/UpdateChecker.cs

@@ -24,7 +24,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.1.5";
+        public const string Version = "4.1.6";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {