Sunset reminder for v201811

[Google Ad Manager API Sunset Announcements]

Version 201811 of the Ad Manager API will be sunset on Monday, December 2, 2019 in accordance with the standard deprecation timeline. For more details, see our deprecation schedule and the post on our developer blog.

I'd also like to point out a new feature we've added to help you stay aware of our deprecation/sunset schedule. From the blog post: "We now provide a machine-readable version of our deprecation schedule, giving you more flexibility to stay up to date with the latest Ad Manager API features. You can access this CSV file at https://developers.google.com/ad-manager/downloads/api-schedule.csv."

- Donovan McMurray, Ad Manager API Team