Update multidict from 4.0.0 to 4.1.0 (#2694)
Update multidict from 4.0.0 to 4.1.0 (#2694)


arthurdarcet/aiohttp,KeepSafe/aiohttp,hellysmile/aiohttp,arthurdarcet/aiohttp,hellysmile/aiohttp,rutsky/aiohttp,arthurdarcet/aiohttp,KeepSafe/aiohttp,KeepSafe/aiohttp,pfreixes/aiohttp,pfreixes/aiohttp,rutsky/aiohttp,rutsky/aiohttp