PSA: publish WD of Screen Orientation on Oct 21

[Arthur Barstow]

Hi All,

Mounir would like to publish a new WD of Screen Orientation and the 
target date for that publication is October 21:

  <https://w3c.github.io/screen-orientation/>

If anyone has any major concerns about this plan, please speak up as 
soon as possible.

-Thanks, AB