We currently have useless branches for 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 3.0, 3.1, and 3.2. I suggest tagging the HEAD of each branch (x.x-EOL, perhaps?) and then deleting the branch. Having those branches makes the branch list unwieldy in the GitHub UI, and also (but less so) in command line usage. Keeping those branches might also make unfamiliar contributors think that they are valid targets for changes.