Fixed bell on history ends

src/reader/mod.rs

@@ -227,6 +227,7 @@ impl ReaderState {
         let h = self.history.clone();
         let mut i = self.history_inx;
         if i.map_or(false, |v| v+1 == h.len()) {
+            bell();
             return;
         }
         if i.is_none() {
@@ -254,6 +255,7 @@ impl ReaderState {
         let h = self.history.clone();
         let mut i = self.history_inx;
         if i.is_none() {
+            bell();
             return;
         } else if i.map_or(false, |v| v == 0) {
             self.saved_restore();