Pruning very old PRs

Stream: batteries

[François G. Dorais]

I'm in the process of closing some very old PRs. Let me know if I mistakenly close a PR that you still care about. I will happily reopen it.

https://github.com/leanprover-community/batteries/pulls?q=is%3Apr+is%3Aclosed+sort%3Aupdated-desc