Amended to add invisible status

src/Discord.Net/DiscordClient.cs

@@ -324,8 +324,8 @@ namespace Discord
         public void SetStatus(UserStatus status)
         {
             if (status == null) throw new ArgumentNullException(nameof(status));
-            if (status != UserStatus.Online && status != UserStatus.Idle && status != UserStatus.DoNotDisturb)
-                throw new ArgumentException($"Invalid status, must be {UserStatus.Online}, {UserStatus.Idle} or {UserStatus.DoNotDisturb}", nameof(status));
+            if (status != UserStatus.Online && status != UserStatus.Idle && status != UserStatus.DoNotDisturb && status != UserStatus.Invisible)
+                throw new ArgumentException($"Invalid status, must be {UserStatus.Online}, {UserStatus.Idle}, {UserStatus.DoNotDisturb} or {UserStatus.Invisible}", nameof(status));
 
             Status = status;
             SendStatus();

src/Discord.Net/Enums/UserStatus.cs

@@ -10,6 +10,8 @@
 		public static UserStatus Offline { get; } = new UserStatus("offline");
 		/// <summary> User is busy. </summary>
 		public static UserStatus DoNotDisturb { get; } = new UserStatus("dnd");
+		/// <summary> User is invisible. </summary>
+		public static UserStatus Invisible { get; } = new UserStatus("invisible");
 
 		private UserStatus(string value)
 			: base(value) { }
@@ -28,6 +30,8 @@
 					return Offline;
 				case "dnd":
 					return DoNotDisturb;
+				case "invisible":
+					return Invisible;
 				default:
 					return new UserStatus(value);
 			}