osu: Implement check button!

youmubot-osu/src/request.rs

@@ -1,3 +1,5 @@
+use core::fmt;
+
 use crate::models::{Mode, Mods};
 use crate::Client;
 use rosu_v2::error::OsuError;
@@ -9,6 +11,15 @@ pub enum UserID {
     ID(u64),
 }
 
+impl fmt::Display for UserID {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            UserID::Username(u) => u.fmt(f),
+            UserID::ID(id) => id.fmt(f),
+        }
+    }
+}
+
 impl From<UserID> for rosu_v2::prelude::UserId {
     fn from(value: UserID) -> Self {
         match value {