Tox-pipenv

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* Bugfix : Support for Tox 3.9+ (67)

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* Bugfix : Support for Tox 3.8 (66)

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* Update: Added support for tox 3.7.0 (60)

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Bugfix : Tox-pipenv would skip the installation of Pipfile if the user had not specified any additional deps in tox.ini (53)

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* Bugfix : Support for Tox 3.0+
* Bugfix : Fixed API in Tox 3.4.0+
* Bugfix : Removed pinned version which fixes pipenv issue (50)

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* Bugfix : Tox would fail when executed twice if usedevelop was set to True, reported by ashwinvis 46
* Bugfix : Any additional dependencies specified in `deps` within tox.ini would be written to the root Pipfile. A temporary Pipfile is created
for each virtualenv now, which is a clone of the root Pipfile