If you found a bug in python-ldap, or would request a new feature,
this is the place to let us know.

Please describe the issue and your environment here.

Issue description:

when I create SSSRequestControl(ordering_rules=['-uidNumber'] its fail because "basestring" in init method not exists in python3.

tips: set basestring = str

Steps to reproduce:

Operating system:

Python version: 3.7

python-ldap version: 3.1.0