<!--
Pull requests should always be made for the `master` branch first, as that's
where development happens and the source of all future stable release branches.

Relevant fixes are cherry-picked for stable branches as needed.

Do not create a pull request for stable branches unless the change is already
available in the `master` branch and it cannot be easily cherry-picked.
Alternatively, if the change is only relevant for that branch (e.g. rendering
fixes for the 3.2 branch).
-->

Add a PR template with a message about PRs needing to be for master
Add a PR template with a message about PRs needing to be for master

[ci skip]

Co-authored-by: Rémi Verschelde <4a7fb8776e4352f674590468e6fa4ef4f32789c1@gmail.com>
