Pythx

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- Handle ambiguous :code:`MYTHX_API_URL` declarations
- Various dependency upgrades

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- Add additional analysis/group list filter parameters
- Various dependency upgrades

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- Remove trial user support as it has been dropped from the API

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- Add pypy3 tests in Travis CI
- Add additional query param support to analysis list handler
- Add various test suite improvements
- Drop support for Python 3.5 and add support for Python 3.8
- Remove stale parameter config options
- Remove stale configuration object support
- Improve PyPI trove classifiers
- Various dependency upgrades

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- Extend status code range for failure check in API handler

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- Fix bug where empty query parameters were sent to the API
- Introduce group ID/name middleware
- Add group status support in client
- Add group creation/sealing support in client
- Add group list support in client
- Fix dependency conflict between :code:`mythx-cli` and :code:`mythx-models`
- Various dependency upgrades