Feature request: Shortcut for annotate in review mode

`task` has the `annotate` command. I would consider a shortcut (maybe `a`) in the review mode of `tasksh` very useful that would allow to annotate a task. Currently this is possible using `e`(dit).

One may raise the question why there should be a shortcut for annotate, but not for other commands that modify a task (such as "start" and "stop"). The only argument I am giving here is that in my personal experience I observed a demand for "annotate" when reviewing tasks more than for other commands that modify a task. This might be different for others.