list sorted

src/main.rs

@@ -94,7 +94,9 @@ fn add(id: &String) -> io::Result<()> {
 
 fn list() -> io:: Result<()> {
     let db = read_db()?;
-    for item in db.iter() {
+    let mut vec: Vec<_> = db.iter().collect();
+    vec.sort();
+    for item in &vec {
         println!("{}", item);
     }
     Ok(())