[3.7] bpo-26510: Add versionchanged for required arg of add_subparsers (GH-16588)#16609

miss-islington merged 1 commit intopython:3.7python/cpython:3.7from

miss-islington:backport-9e71917-3.7miss-islington/cpython:backport-9e71917-3.7Copy head branch name to clipboard