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Go to project repository: https://github.com/gregmuellegger/django-sortedm2m

Star and fork the project, then clone it locally on your computer.

As the project documentation suggest: "use tox to run the tests for all relevant python versions all at once. Therefore install tox with pip install tox, then type in the root directory of the django-sortedm2m checkout: tox"

Now update the tox.ini adding Django 2.0 and run the tests again.

If everything works, move forward committing the code and do the pull-request on the original repository and fix any issue highligthed during the review by your mentors.