- Make sure the tests are executed

- specfile:
  * require filelock
  * CHANGELOG.rst ->changelog.rst, added CONTRIBUTORS CONTRIBUTING.rst to doc
  * add fdupes
- update to version 3.5.2:
  * Bugfixes
    + session packages are now put inside a numbered directory
      (instead of prefix numbering it, because pip fails when wheels
      are not named according to `PEP-491
      <https://www.python.org/dev/peps/pep-0491/#id9>`_, and prefix
      numbering messes with this) - by :user:`gaborbernat` (`#1042
      <https://github.com/tox-dev/tox/issues/1042>`_)
  * Features
    + level three verbosity ("-vvv") show the packaging output - by
      :user:`gaborbernat` (`#1047
      <https://github.com/tox-dev/tox/issues/1047>`_)
- changes from version 3.5.1:
  * Bugfixes
    + fix regression with "3.5.0": specifying "--installpkg" raises
      "AttributeError: 'str' object has no attribute 'basename'"
      (`#1042 <https://github.com/tox-dev/tox/issues/1042>`_)
- changes from version 3.5.0:
  * Bugfixes
    + intermittent failures with "--parallel--safe-build", instead of
      mangling with the file paths now uses a lock to make the package
      build operation thread safe and is now on by default
      ("--parallel--safe-build" is now deprecated) - by
      :user:`gaborbernat` (`#1026

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