setup.py: set version to 3.4.3; write the release procedure
setup.py: set version to 3.4.3; write the release procedure

fallen/asyncio,Martiusweb/asyncio,gsb-eng/asyncio,ajdavis/asyncio,1st1/asyncio,Martiusweb/asyncio,gvanrossum/asyncio,vxgmichel/asyncio,gvanrossum/asyncio,1st1/asyncio,ajdavis/asyncio,Martiusweb/asyncio,fallen/asyncio,manipopopo/asyncio,gvanrossum/asyncio,gsb-eng/asyncio,manipopopo/asyncio,jashandeep-sohi/asyncio,gsb-eng/asyncio,jashandeep-sohi/asyncio,haypo/trollius,haypo/trollius,1st1/asyncio,manipopopo/asyncio,haypo/trollius,vxgmichel/asyncio,fallen/asyncio,vxgmichel/asyncio,ajdavis/asyncio,jashandeep-sohi/asyncio