Evict failed futures from cache; replace deprecated get_event_loop#13

jtschoonhoven wants to merge 1 commit intoimnotjames:mainimnotjames/cachetools-async:mainfrom

jtschoonhoven:fix/evict-failed-futures-and-modernize-event-loopjtschoonhoven/cachetools-async:fix/evict-failed-futures-and-modernize-event-loopCopy head branch name to clipboard