Add flake8 target to tox.ini
Add flake8 target to tox.ini

panda73111/aiohttp,andyaguiar/aiohttp,vaskalas/aiohttp,moden-py/aiohttp,esaezgil/aiohttp,decentfox/aiohttp,rutsky/aiohttp,panda73111/aiohttp,alex-eri/aiohttp-1,mind1master/aiohttp,jashandeep-sohi/aiohttp,singulared/aiohttp,AlexLisovoy/aiohttp,z2v/aiohttp,alex-eri/aiohttp-1,alexsdutton/aiohttp,pfreixes/aiohttp,alex-eri/aiohttp-1,KeepSafe/aiohttp,morgan-del/aiohttp,vaskalas/aiohttp,mind1master/aiohttp,jettify/aiohttp,z2v/aiohttp,elastic-coders/aiohttp,jojurajan/aiohttp,mind1master/aiohttp,panda73111/aiohttp,moden-py/aiohttp,singulared/aiohttp,pathcl/aiohttp,iksteen/aiohttp,esaezgil/aiohttp,danielnelson/aiohttp,singulared/aiohttp,jojurajan/aiohttp,esaezgil/aiohttp,hellysmile/aiohttp,sterwill/aiohttp,vaskalas/aiohttp,elastic-coders/aiohttp,decentfox/aiohttp,elastic-coders/aiohttp,z2v/aiohttp,juliatem/aiohttp,Insoleet/aiohttp,moden-py/aiohttp,jashandeep-sohi/aiohttp,vedun/aiohttp,AlexLisovoy/aiohttp,jettify/aiohttp,alunduil/aiohttp,rutsky/aiohttp,jettify/aiohttp,arthurdarcet/aiohttp,KeepSafe/aiohttp,decentfox/aiohttp,noodle-learns-programming/aiohttp,hellysmile/aiohttp,juliatem/aiohttp,arthurdarcet/aiohttp,rutsky/aiohttp,vasylbo/aiohttp,jashandeep-sohi/aiohttp,KeepSafe/aiohttp,arthurdarcet/aiohttp,alexsdutton/aiohttp,avanov/aiohttp,playpauseandstop/aiohttp,Srogozins/aiohttp,AraHaanOrg/aiohttp,pfreixes/aiohttp,iksteen/aiohttp,Eyepea/aiohttp,flying-sheep/aiohttp,AraHaanOrg/aiohttp