feat: add context manager support in client#84

gcf-merge-on-green[bot] merged 2 commits into

maingoogleapis/python-binary-authorization:mainfrom

owl-bot-6a81a1ff-61f8-40c7-9b6a-845afb7e60ebgoogleapis/python-binary-authorization:owl-bot-6a81a1ff-61f8-40c7-9b6a-845afb7e60ebCopy head branch name to clipboard