Add: Editor note for JOSS submission step to editor checks post review / next steps

[lwasser]

pyOpenSci/software-submission#20 (comment)

And the comment linked here says:

If you frequently have submissions which would also like to submit to JOSS, consider templating a short paragraph to add to the 'notes to editor' section on the JOSS submission form [e.g. "This has been reviewed and accepted by pyOpenSci (link to issue), and is currently archived on Zenodo/Figshare/other (link to archive or DOI)"]. This won't save much time, but will just make sure info that needs to be communicated is automatically included (you might even be able to prefill some of this data with a query attached to the JOSS submission URL, although my quick test of this didn't quite get there..).

It would be good to add this if its not already there.