Lock Bleach version to pre-5.x because of breaking change to keyword argument

On a fresh install, I got the same issue described here: https://github.com/summernote/django-summernote/issues/477


I believe the issue is occurring because the Pipfile pulled Bleach 5.x. Pegging Bleach to <5.0.0 makes the problem go away. This might not be the best fix; it might be a better idea to update the parameter name and lock to >=5.0.0.

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