Sphinx-test-reports

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* Improvement: Added :ref:`test-report` directive.
* Improvement: Introduces :ref:`tr_file`, :ref:`tr_suite` and :ref:`tr_case` options to customize names.
* Improvement: Not found files will throw warning instead of exception so that build goes on.
* Improvement: Provides css_classes ``tr_passed``, ``tr_failure``, ``tr_skipped`` to colorize needs and their rows in tables.
* Bugfix: Stabilised extension initialisation phase.

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* Improvement: Support of case and table colors based on ``result``.
* Bugfix: Hash-Id for autogenerated test-cases size was increased.

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* Improvement: Using `sphinx-needs <https://sphinx-needs.readthedocs.io/en/latest/>`_ for data representation
and filtering.
* Improvement: New directives :ref:`test-file`, :ref:`test-suite` and :ref:`test-case`.
* Improvement: New possibilities to :ref:`filter test data <filter>`.
* Improvement: Much better documentation.

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* Skipped support für Python < 3.5.
* Bugfix: junit-file-format of pytest > 5.1.0 supported. `8 <https://github.com/useblocks/sphinx-test-reports/issues/8>`_

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**Initial start for the changelog**

* Improvement: added directive ``:test-env:`` to take tox-envreport.json as input and create a table.