Updated Message Model

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

@@ -27,5 +27,7 @@ namespace Discord.API
         public Attachment[] Attachments { get; set; }
         [JsonProperty("embeds")]
         public Embed[] Embeds { get; set; }
+        [JsonProperty("nonce")]
+        public uint? Nonce { get; set; }
     }
 }