remove python 3.7 from tests. 
==========================================
 ``celery.security.utils``
==========================================

.. contents::
    :local:
.. currentmodule:: celery.security.utils

.. automodule:: celery.security.utils
    :members:
    :undoc-members:

==========================================
 ``celery.security.utils``
==========================================

.. contents::
    :local:
.. currentmodule:: celery.security.utils

.. automodule:: celery.security.utils
    :members:
    :undoc-members:
