add acl param to the table

Author: AstinCHOI

README.rst

@@ -124,6 +124,7 @@ Usage
  end_time When does this token expire? 'end_time' overrides 'window_seconds'
  window_seconds How long is this token valid for?
  field_delimiter Character used to delimit token body fields. [Default: ~]
+ acl_delimiter Character used to delimit acl. [ Default: ! ]
  escape_early Causes strings to be 'url' encoded before being used.
  verbose Print all parameters.
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