'Retires a grant. You can retire a grant when you\'re done using
it to clean up. You should revoke a grant when you intend to
actively deny operations that depend on it.
:type grant_token: string
:param grant_token: Token that identifies the grant to be retired.'

def retire_grant(self, grant_token):

    params = {'GrantToken': grant_token}
    return self.make_request(action='RetireGrant', body=json.dumps(params))
