ID must start from 1 again

At the beginning of tutorial4, The database had been removed

docs/tutorial/4-authentication-and-permissions.md

@@ -209,7 +209,7 @@ We can make a successful request by including the username and password of one o
     http -a tom:password123 POST http://127.0.0.1:8000/snippets/ code="print 789"
 
     {
-        "id": 5,
+        "id": 1,
         "owner": "tom",
         "title": "foo",
         "code": "print 789",