Update the TODO file.

TODO

@@ -63,9 +63,13 @@
 * TODO Simulate an Undo/Redo feature
   Keep a separated queue for sent commands
 
+* TODO Simulate a Kill/Yank feature
+
 * TODO Add an ephemeral state
   - Keep a copy of the expected (status . playlist) in the queue
   - Subsequent commands will work with this not yet existant '(status . playlist)
+
 * TODO Prevent sending unnecessary commands
   If there is already one on the queue, for example
+
 * TODO Add a timeout that reconnects to the server