Add a missing property copying in Node.clone.
Add a missing property copying in Node.clone.

d1hotpep/peewee,zhang625272514/peewee,coleifer/peewee,Sunzhifeng/peewee,Sunzhifeng/peewee,bopo/peewee,coleifer/peewee,fuzeman/peewee,Sunzhifeng/peewee,d1hotpep/peewee,jarrahwu/peewee,coleifer/peewee,coreos/peewee,new-xiaji/peewee,py4a/peewee,new-xiaji/peewee,stas/peewee,ronyb29/peewee,wenxer/peewee,coreos/peewee,jarrahwu/peewee,zhang625272514/peewee,lez/peewee,fuzeman/peewee,Dipsomaniac/peewee,Dipsomaniac/peewee,zhang625272514/peewee,wenxer/peewee,jnovinger/peewee,jarrahwu/peewee,Dipsomaniac/peewee,bopo/peewee,ghukill/peewee,mackjoner/peewee,coreos/peewee,softside/peewee,new-xiaji/peewee,teserak/peewee,bopo/peewee,jnovinger/peewee