Update default avatar generation

tegakituesday/src/models/user/mod.rs

@@ -92,11 +92,16 @@ impl User {
                 }
             ),
             // Archived user or user with no avatar, calculate default avatar
-            // https://www.reddit.com/r/discordapp/comments/au6v4e/comment/eh61dm6/
-            // https://docs.rs/serenity/0.11.5/serenity/model/user/struct.User.html#method.default_avatar_url
             None => format!(
                 "https://cdn.discordapp.com/embed/avatars/{}.png",
-                self.discriminator % 5
+                // https://docs.rs/serenity/0.12.4/src/serenity/model/user.rs.html#805
+                if self.discriminator == 0 {
+                    // New avatar system
+                    ((self.id >> 22) % 6) as u16
+                } else {
+                    // Old avatar system
+                    self.discriminator % 5
+                }
             ),
         }
     }