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This pull request updates the list of tested Python versions on the tox configuration file and adds two new environments.
Previously, the tox configuration only listed Python 3.7 as a target version for tests. With these changes the tox configuration now lists Python 3.6, 3.7, 3.8, and 3.9. Tox will only create environments for the interpreters available.
The two new environments are "codestyle" and "security".
The code style environment will install and run pycodestyle tool, a.k.a. pep8.
The new security related environment will run two tools to check for potential security issues: