Tox-conda

------------------

- Fix: Environments always recreated, except for version matching env interpreter

------------------

- support of conda-spec.txt and conda-env.yml files

------------------

- Document options within the readme.
- Fix conda not found on Windows.
- Don't display progress bar during conda install.

------------------

- Update to enable compatibility with ``tox-3.8``.

------------------

- Initial release.