awscli alias for du.

.aws/cli/alias

@@ -9,3 +9,4 @@ metadata-region = !python3 << EOF
     response = urlopen('http://169.254.169.254/latest/dynamic/instance-identity/document')
     print(json.loads(response.read().decode('utf-8'))['region'])
     EOF
+du = s3 ls --recursive --human-readable --summarize