change in setup

setup.py

@@ -6,6 +6,7 @@ setup(name='cdplib',
       url='https://intra.acdp.at/gogs/tanja/cdplib.git',
       author='Tatiana Zolotareva',
       author_email='tanja.zolotareva@acdp.at',
+      install_requires=['numpy'],
       license='MIT',
       packages=['cdplib'],
       zip_safe=False)