Changes for pypi distribution

setup.py

@@ -126,7 +126,7 @@ setup(
 
         'Natural Language :: English',
 
-        'Operating System :: POSIX :: Linux',
+        'Operating System :: OS Independent',
 
         # Specify the Python versions you support here. In particular, ensure
         # that you indicate whether you support Python 2, Python 3 or both.
@@ -176,6 +176,7 @@ setup(
         'pyqt': ['PyQt5'],
         'picamera': ['picamera'],
         'gphoto2-cffi': ['gphoto2-cffi'],
+        'dev': ['setuptools', 'wheel'],
     },
 
     python_requires='>=3.5',