Added Voice Channel user_limit

src/Discord.Net/API/Common/Channel.cs

@@ -23,10 +23,16 @@ namespace Discord.API
         public int Position { get; set; }
         [JsonProperty("permission_overwrites")]
         public Overwrite[] PermissionOverwrites { get; set; }
+
+        //TextChannel
         [JsonProperty("topic")]
         public string Topic { get; set; }
+
+        //VoiceChannel
         [JsonProperty("bitrate")]
         public int Bitrate { get; set; }
+        [JsonProperty("user_limit")]
+        public int UserLimit { get; set; }
 
         //DMChannel
         [JsonProperty("recipient")]

src/Discord.Net/API/DiscordAPIClient.cs

@@ -235,6 +235,7 @@ namespace Discord.API
             Preconditions.NotEqual(channelId, 0, nameof(channelId));
             Preconditions.NotNull(args, nameof(args));
             Preconditions.GreaterThan(args.Bitrate, 0, nameof(args.Bitrate));
+            Preconditions.AtLeast(args.UserLimit, 0, nameof(args.Bitrate));
             Preconditions.AtLeast(args.Position, 0, nameof(args.Position));
             Preconditions.NotNullOrEmpty(args.Name, nameof(args.Name));
 

src/Discord.Net/API/Rest/ModifyVoiceChannelParams.cs

@@ -6,5 +6,7 @@ namespace Discord.API.Rest
     {
         [JsonProperty("bitrate")]
         public Optional<int> Bitrate { get; set; }
+        [JsonProperty("user_limit")]
+        public Optional<int> UserLimit { get; set; }
     }
 }

src/Discord.Net/Rest/Entities/Channels/VoiceChannel.cs

@@ -12,6 +12,8 @@ namespace Discord.Rest
     {
         /// <inheritdoc />
         public int Bitrate { get; private set; }
+        /// <inheritdoc />
+        public int UserLimit { get; private set; }
 
         internal VoiceChannel(Guild guild, Model model)
             : base(guild, model)
@@ -21,6 +23,7 @@ namespace Discord.Rest
         {
             base.Update(model);
             Bitrate = model.Bitrate;
+            UserLimit = model.UserLimit;
         }
 
         /// <inheritdoc />