Renamed Message model's Mentions -> UserMentions, added RoleMentions

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

@@ -27,7 +27,9 @@ namespace Discord.API
         [JsonProperty("mention_everyone")]
         public Optional<bool> MentionEveryone { get; set; }
         [JsonProperty("mentions")]
-        public Optional<User[]> Mentions { get; set; }
+        public Optional<User[]> UserMentions { get; set; }
+        [JsonProperty("mention_roles")]
+        public Optional<ulong[]> RoleMentions { get; set; }
         [JsonProperty("attachments")]
         public Optional<Attachment[]> Attachments { get; set; }
         [JsonProperty("embeds")]

src/Discord.Net.Rest/Entities/Messages/RestUserMessage.cs

@@ -86,9 +86,9 @@ namespace Discord.Rest
             }
 
             ImmutableArray<IUser> mentions = ImmutableArray.Create<IUser>();
-            if (model.Mentions.IsSpecified)
+            if (model.UserMentions.IsSpecified)
             {
-                var value = model.Mentions.Value;
+                var value = model.UserMentions.Value;
                 if (value.Length > 0)
                 {
                     var newMentions = ImmutableArray.CreateBuilder<IUser>(value.Length);

src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs

@@ -87,9 +87,9 @@ namespace Discord.WebSocket
             }
 
             ImmutableArray<IUser> mentions = ImmutableArray.Create<IUser>();
-            if (model.Mentions.IsSpecified)
+            if (model.UserMentions.IsSpecified)
             {
-                var value = model.Mentions.Value;
+                var value = model.UserMentions.Value;
                 if (value.Length > 0)
                 {
                     var newMentions = ImmutableArray.CreateBuilder<IUser>(value.Length);