Transition open PRs from the features branch to master

[bluetech]

As part of #6571, we want to delete the features branch, but there are some open PRs against it. This is the list: https://github.com/pytest-dev/pytest/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Aopen+base%3Afeatures

I've asked all of the submitters to rebase on master. Once the list becomes empty, we can do the deletion.

[nicoddemus]

Thanks, I like how you took the time to write a short message to each PR. 👍

[nicoddemus]

Btw we might consider just changing the target of the PRs ourselves, that's what I did in #6410 and didn't have any repercussions there.

[bluetech]

I thought I'd give the authors a chance to do it themselves, but after some time we can switch it ourselves. ATM there are 4 PRs left.

[nicoddemus]

Sounds good, should we give ourselves a "deadline"? How about Monday?

[bluetech]

Fine by me!

[bluetech]

@nicoddemus Oops, I remembered Sunday but you said Monday. Anyway, I've changed the remaning PRs manually and the list is clear now.

[nicoddemus]

No problem, all good then. 👍

[nicoddemus]

Just deleted features (was 4209ad6).