[Calypso] [PATCH] setup.py: fix test requirements

[Jelmer Vernooij]

On Sun, Apr 10, 2016 at 12:49:42PM +0200, Guido Günther wrote:
> It's tests_require not test_requires, fixes:
> 
>  python setup.py clean -a
>  /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'test_requires'

LGTM