Fix leaderboard truncation

src/utils.rs

@@ -440,6 +440,7 @@ pub async fn leaderboard(ctx: &Context<'_>) -> Result<(), Error> {
     let mut file = std::fs::OpenOptions::new()
         .create(true)
         .write(true)
+        .truncate(true)
         .open(env::var("LEADERBOARD").unwrap())
         .unwrap();
     file.write_all(leaderboard_html.as_bytes())?;