'Revoke all impersonation tokens for the current user.
This is only available for admins of a GitHub Enterprise instance.
:returns: bool -- True if successful, False otherwise'

@requires_auth
def revoke_impersonation(self):

    url = self._build_url(u'admin', u'users', self.login, u'authorizations')
    return self._boolean(self._delete(url), 204, 403)
