Move `master` branch to `main`

Cc @schloerke

The master branch of this repository will soon be renamed to main, as part of a coordinated change across several GitHub organizations (including, but not limited to: tidyverse, r-lib, tidymodels, and sol-eng). We anticipate this will happen by the end of September 2021.

That will be preceded by a release of the usethis package, which will gain some functionality around detecting and adapting to a renamed default branch. There will also be a blog post at the time of this master --> main change.

The purpose of this issue is to:

• Help us firm up the list of targetted repositories
• Make sure all maintainers are aware of what's coming
• Give us an issue to close when the job is done
• Give us a place to put advice for collaborators re: how to adapt

message id: entire_lizard

Aucun fichier ni test n’est indiqué. Commencez par vérifier la branche par défaut actuelle du dépôt et les conseils usethis mentionnés, puis confirmez le dépôt cible et la coordination avec les mainteneurs décrite dans l’issue. Le travail est terminé lorsque la migration de la branche est coordonnée et que les conseils destinés aux collaborateurs sont consignés.