Google Code-in

Zulip has a number of "legacy" API URLs that are not properly available via the Zulip REST API, which are present in zproject/legacy_urls.py in the main Zulip project. A detailed descripton of how to do this sort of migraiton is available here: https://github.com/zulip/zulip-gci/blob/master/tasks/legacy_urls.md.

The URLs you are to migrate for this task are json/update_message; you should migrate them in the following fashion:

Move to PATCH /messages/(?P ).