Update base.py
Update base.py

Hi!

I've noticed, that current implementation does not allow to disable returncode verification for the whole Pipeline,
eg. (netstat["-tnlp"] | grep[pid] | grep[port])(retcode = None)
still fails at grep[pid]: nonzero returncode
while (netstat["-tnlp"] | grep[pid])(retcode = None)
works as expected

Am I missing something?

Thanks! :)
tomerfiliba/plumbum,tomerfiliba/plumbum,AndydeCleyre/plumbum,AndydeCleyre/plumbum