Update a tag

{
	"tag":{
		"tag": "My Tag",
		"tagType": "contact",
		"description": "Description"
	}
}

{
    "tag": {
        "tagType": "contact",
        "tag": "My Tag",
        "description": "Description",
        "cdate": "2018-08-17T13:41:16-05:00",
        "links": {
            "contactGoalTags": "https://:account.api-us1.com/api/:version/tags/2/contactGoalTags"
        },
        "id": "2"
    }
}