[isort] add known 3rd party to setup.cfg (#4053)
* add known 3rd party to setup.cfg * comment * Update CONTRIBUTING.md Co-authored-by: Julien Chaumond <chaumond@gmail.com>
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* add known 3rd party to setup.cfg * comment * Update CONTRIBUTING.md Co-authored-by: Julien Chaumond <chaumond@gmail.com>