Update NEWS for 0.6.0
Update NEWS for 0.6.0

ebassi/json-glib,brauliobo/json-glib,brauliobo/json-glib,Distrotech/json-glib,frida/json-glib,robtaylor/json-glib-gvariant,Distrotech/json-glib,GNOME/json-glib,oerdnj/json-glib,ebassi/json-glib,ebassi/json-glib,Distrotech/json-glib,oerdnj/json-glib,GNOME/json-glib,brauliobo/json-glib,oerdnj/json-glib,robtaylor/json-glib-gvariant,oerdnj/json-glib,frida/json-glib