drop OS tags from package

setup.py

@@ -45,8 +45,6 @@ setup(name='fatamorgana',
             'Intended Audience :: Manufacturing',
             'Intended Audience :: Science/Research',
             'License :: OSI Approved :: GNU Affero General Public License v3',
-            'Operating System :: POSIX :: Linux',
-            'Operating System :: Microsoft :: Windows',
             'Topic :: Scientific/Engineering',
             'Topic :: Scientific/Engineering :: Electronic Design Automation (EDA)',
       ],