v6.19.0 changelog [skip ci] (#4846)
v6.19.0 changelog [skip ci] (#4846)


Skillupco/babel,chicoxyzzy/babel,bcoe/babel,babel/babel,kellyselden/babel,guybedford/babel,ccschneidr/babel,chicoxyzzy/babel,maurobringolf/babel,rmacklin/babel,samwgoldman/babel,shuhei/babel,kaicataldo/babel,kaicataldo/babel,kedromelon/babel,STRML/babel,hzoo/babel,kellyselden/babel,samwgoldman/babel,kedromelon/babel,maurobringolf/babel,vadzim/babel,guybedford/babel,hulkish/babel,hzoo/babel,PolymerLabs/babel,tikotzky/babel,guybedford/babel,chicoxyzzy/babel,zjmiller/babel,PolymerLabs/babel,babel/babel,kellyselden/babel,hzoo/babel,ccschneidr/babel,hulkish/babel,babel/babel,samwgoldman/babel,kassens/babel,shuhei/babel,zertosh/babel,chicoxyzzy/babel,jridgewell/babel,bcoe/babel,rmacklin/babel,claudiopro/babel,shuhei/babel,Skillupco/babel,hzoo/babel,kedromelon/babel,babel/babel,kaicataldo/babel,kaicataldo/babel,STRML/babel,existentialism/babel,tikotzky/babel,hulkish/babel,maurobringolf/babel,hulkish/babel,claudiopro/babel,claudiopro/babel,Skillupco/babel,existentialism/babel,jridgewell/babel,zertosh/babel,Skillupco/babel,vadzim/babel,PolymerLabs/babel,existentialism/babel,jridgewell/babel,jridgewell/babel,kellyselden/babel,zjmiller/babel,kassens/babel