[ifcbrk] feature: suppress messages

yeah man I support the first amendment

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

@@ -50,5 +50,7 @@ namespace Discord.API
         // sent with Rich Presence-related chat embeds
         [JsonProperty("application")]
         public Optional<MessageApplication> Application { get; set; }
+        [JsonProperty("flags")]
+        public Optional<MessageFlags> Flags { get; set; }
     }
 }