Added tox configuration and updating dependency reqs #166
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Updating requirements and adding tox.
The current repo is using a Dockerfile to test Python 3.9 compatibility. I'm proposing using tox to automatically execute tests across different versions of Python.
There have been some inconsistencies recently with the cryptography and pyOpenSSL libraries between versions and I'm hoping this will ensure we can safely test the package installs and unit tests on each version of Python that schemachange supports.
Closes #165