Draft NOTES for 1.13.0

@mglukhovsky can you please review?

@danielmewes @Tryneus @mlucy @danielmewes @neumino @srh Please also take a look to make sure I haven't mis-characterized some of your fixes.
We settled on "commands" some time ago in the docs.
Also `r.changes` is not defined, we should have `r.args` and `changes`, or `args` and `changes`.