fix: pass snapshot_millis to the main function (#8)

Co-authored-by: Tim Swast <swast@google.com>

Author: alexander-fenster

samples/quickstart.py

@@ -97,4 +97,4 @@ def main(project_id="your-project-id", snapshot_millis=0):
     parser.add_argument("project_id")
     parser.add_argument("--snapshot_millis", default=0, type=int)
     args = parser.parse_args()
-    main(project_id=args.project_id)
+    main(project_id=args.project_id, snapshot_millis=args.snapshot_millis)