Rewrite README to using async/await
Rewrite README to using async/await

esaezgil/aiohttp,hellysmile/aiohttp,alex-eri/aiohttp-1,panda73111/aiohttp,jettify/aiohttp,vaskalas/aiohttp,alex-eri/aiohttp-1,esaezgil/aiohttp,jettify/aiohttp,rutsky/aiohttp,decentfox/aiohttp,singulared/aiohttp,esaezgil/aiohttp,arthurdarcet/aiohttp,Eyepea/aiohttp,elastic-coders/aiohttp,mind1master/aiohttp,jashandeep-sohi/aiohttp,hellysmile/aiohttp,pfreixes/aiohttp,KeepSafe/aiohttp,KeepSafe/aiohttp,singulared/aiohttp,AraHaanOrg/aiohttp,arthurdarcet/aiohttp,panda73111/aiohttp,Insoleet/aiohttp,AraHaanOrg/aiohttp,arthurdarcet/aiohttp,moden-py/aiohttp,rutsky/aiohttp,z2v/aiohttp,KeepSafe/aiohttp,elastic-coders/aiohttp,moden-py/aiohttp,z2v/aiohttp,jettify/aiohttp,flying-sheep/aiohttp,jashandeep-sohi/aiohttp,Srogozins/aiohttp,decentfox/aiohttp,pfreixes/aiohttp,juliatem/aiohttp,z2v/aiohttp,juliatem/aiohttp,decentfox/aiohttp,vaskalas/aiohttp,rutsky/aiohttp,jashandeep-sohi/aiohttp,singulared/aiohttp,panda73111/aiohttp,vaskalas/aiohttp,mind1master/aiohttp,elastic-coders/aiohttp,alex-eri/aiohttp-1,playpauseandstop/aiohttp,mind1master/aiohttp,moden-py/aiohttp