- 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
`_, and prefix
numbering messes with this) - by :user:`gaborbernat` (`#1042
`_)
* Features
+ level three verbosity ("-vvv") show the packaging output - by
:user:`gaborbernat` (`#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 `_)
- 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