Checking full_audit value instead of existence

I saw that a migration with the full_audit value set to false was still crating the timestamp columns

{
	"up":{
		"create_table":{
			"name":"Test1","full_audit":false, <---- timestamp columns still added
			"columns":[{
			"name":"Name","type":"string"}]
		}
	},
	"down":{
		"drop_table":"Test1"}}