fix wrong range used

src/input.rs

@@ -77,7 +77,7 @@ impl<I: Iterator<Item = Result<char, io::CharsError>>> Iterator for Keys<I> {
                     Some(Ok('B')) => Key::Down,
                     Some(Ok('H')) => Key::Home,
                     Some(Ok('F')) => Key::End,
-                    Some(Ok(c @ '1' ... '6')) => match self.chars.next() {
+                    Some(Ok(c @ '1' ... '8')) => match self.chars.next() {
                         Some(Ok('~')) => match c {
                             '1' | '7' => Key::Home,
                             '2' | '8' => Key::Insert,