gotail: add -p argument to use polling
gotail: add -p argument to use polling

walmartlabs/tail,funkygao/tail,davidsansome/tail,vektra/tail,funkygao/tail,ekini/tail,mathpl/tail,araddon/tail,bfitzsimmons/tail,GeertJohan/tail,masahide/tail,ando-masaki/tail,QLeelulu/tail,dim/tail,miraclesu/tail,bcandrea/tail,GeertJohan/tail,ActiveState/tail,42wim/tail,mathpl/tail,flynn/tail,dim/tail,bububa/tail,liyam/tail,wfxiang08/tail,wrouesnel/tail,bububa/tail,deepakm/tail,rakutentech/tail