Update Python classifiers

Author: mdmintz

setup.py

@@ -71,6 +71,10 @@
     license="MIT",
     classifiers=[
         "Development Status :: 5 - Production/Stable",
+        "Environment :: Console",
+        "Environment :: MacOS X",
+        "Environment :: Win32 (MS Windows)",
+        "Environment :: Web Environment",
         "Framework :: Pytest",
         "Intended Audience :: Developers",
         "Intended Audience :: Information Technology",