Added NicknameMention to IUser

src/Discord.Net/Entities/Users/GuildUser.cs

@@ -31,6 +31,7 @@ namespace Discord
         public bool IsAttached => User.IsAttached;
         public bool IsBot => User.IsBot;
         public string Mention => User.Mention;
+        public string NicknameMention => User.NicknameMention;
         public string Username => User.Username;
 
         public virtual UserStatus Status => UserStatus.Unknown;

src/Discord.Net/Entities/Users/IUser.cs

@@ -12,5 +12,7 @@ namespace Discord
         bool IsBot { get; }
         /// <summary> Gets the username for this user. </summary>
         string Username { get; }
+        /// <summary> Returns a special string used to mention this object, by nickname.  </summary>
+        string NicknameMention { get; }
     }
 }

src/Discord.Net/Entities/WebSocket/CachedDMUser.cs

@@ -20,6 +20,7 @@ namespace Discord
         public bool IsAttached => User.IsAttached;
         public bool IsBot => User.IsBot;
         public string Mention => User.Mention;
+        public string NicknameMention => User.NicknameMention;
         public string Username => User.Username;
 
         public CachedDMUser(CachedGlobalUser user)