[setup.py] Add more relevant classifiers

setup.py

@@ -124,6 +124,8 @@ setup(
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
         'License :: Public Domain',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
@@ -132,6 +134,12 @@ setup(
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: Implementation',
+        'Programming Language :: Python :: Implementation :: CPython',
+        'Programming Language :: Python :: Implementation :: IronPython',
+        'Programming Language :: Python :: Implementation :: Jython',
+        'Programming Language :: Python :: Implementation :: PyPy',
     ],
 
     cmdclass={'build_lazy_extractors': build_lazy_extractors},