Use :py:const:`None` consistently
Use :py:const:`None` consistently

reaperhulk/pyopenssl,r0ro/pyopenssl,reaperhulk/pyopenssl,adamwolf/pyopenssl,mschmo/pyopenssl,aalba6675/pyopenssl,samv/pyopenssl,kjav/pyopenssl,hynek/pyopenssl,aalba6675/pyopenssl,sholsapp/pyopenssl,sorenh/pyopenssl,hynek/pyopenssl,mitghi/pyopenssl,daodaoliang/pyopenssl,pyca/pyopenssl,mhils/pyopenssl,mhils/pyopenssl,r0ro/pyopenssl,mitghi/pyopenssl