Bump to 0.21.0a2
Bump to 0.21.0a2

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