use pr instead of tag for changelog/prs [skip ci] (#6819)
use pr instead of tag for changelog/prs [skip ci] (#6819)


hulkish/babel,Skillupco/babel,samwgoldman/babel,claudiopro/babel,hzoo/babel,babel/babel,kellyselden/babel,Skillupco/babel,kellyselden/babel,guybedford/babel,babel/babel,shuhei/babel,PolymerLabs/babel,kaicataldo/babel,jridgewell/babel,PolymerLabs/babel,chicoxyzzy/babel,claudiopro/babel,claudiopro/babel,existentialism/babel,hulkish/babel,shuhei/babel,jridgewell/babel,kaicataldo/babel,kellyselden/babel,chicoxyzzy/babel,hzoo/babel,babel/babel,kaicataldo/babel,PolymerLabs/babel,vadzim/babel,Skillupco/babel,guybedford/babel,shuhei/babel,babel/babel,samwgoldman/babel,vadzim/babel,hulkish/babel,chicoxyzzy/babel,maurobringolf/babel,jridgewell/babel,guybedford/babel,samwgoldman/babel,chicoxyzzy/babel,existentialism/babel,hulkish/babel,maurobringolf/babel,kellyselden/babel,existentialism/babel,maurobringolf/babel,jridgewell/babel,Skillupco/babel,kaicataldo/babel,hzoo/babel,hzoo/babel