Fix compile error

src/main.rs

@@ -67,6 +67,7 @@ fn update_list() -> String {
 
 		println!("Guilds updated!");
 	}
+	"done".to_owned()
 }
 
 fn main() {
@@ -84,4 +85,4 @@ fn establish_connection() -> PgConnection {
         .expect("DATABASE_URL must be set");
     PgConnection::establish(&database_url)
         .expect(&format!("Error connecting to {}", database_url))
-}
+}