Thomas Grainger and Adi Roiban have worked together to bump up the minimum Python version to 3.5.3 for thisrelease ( https://github.com/twisted/twisted/pull/1524 ), and are not approving the PR that I have submittedin PR 1525. Even though you approved PR 1525, I cannot merge it because only PR reviews by people withwrite access to the Twisted repo can be merged to the Twisted repo.
I am going to proceed with the release as-is with Python 3.5.3 as the minimum version. I hope that is OK for your needs.
It looks to me like https://github.com/twisted/twisted/pull/1524 sets the minimum python version to 3.5.4, so I think we're good and #1525 should just be closed as a duplicate.
Thanks for getting the release out!