Allow a Taskwarrior question arising from a task update to be answered

When updating a recurring task, Taskwarrior sometimes asks a question like:

> This is a recurring task.  Do you want to modify all pending recurrences of this same task? (yes/no)

It wasn't possible to answer a like this question with taskw, but this patch fixes that problem for me.

What do you think?

If it looks okay, I'll try to write a test for it.