How do I change from a PR to a draft PR at github?
Update - Now Available - Jan 2020
Convert Default → Draft
This is possible now, with an option below "Reviewers" section in PR.
See: Feature Request: Switch from ready to draft in pull requests
Convert Draft → Default
To answer @marsandback comment Draft PR --> PR, just click the Ready for review
The feature is now available!
See: Feature Request: Switch from ready to draft in pull requests