Update README

Author: kaykayehnn

README.md

@@ -27,6 +27,8 @@ Notice most of the bindings emulate vim cursor movements.
 - `prefix + l` and `prefix + C-l`<br/>
   select pane on the right
 
+These mappings are `repeatable`.
+
 <br/>
 
 **Note**: This overrides tmux's default binding for toggling between last