Merge pull request #434 from eteq/remove-main-warning

remove instructions about master->main transition

Author: pllim

README.md

@@ -4,13 +4,3 @@ Documents and policies regarding the Astropy Project as a whole.  *Drafts* of po
 
 Additionally, the issue tracker will be used to discuss larger Project-wide issues; i.e., those that are not particular to a specific pacakge or other repository.
 
-## If you locally cloned this repo before 15 June 2021
-
-The primary branch for this repo has been transitioned from ``master`` to ``main``.  If you have a local clone of this repository and want to keep your local branch in sync with this repo, you'll need to do the following in your local clone from your terminal:
-```
-git fetch --all --prune
-# you can stop here if you don't use your local "master"/"main" branch
-git branch -m master main
-git branch -u origin/main main
-```
-If you are using a GUI to manage your repos you'll have to find the equivalent commands as it's different for different programs. Alternatively, you can just delete your local clone and re-clone!