Update trove classifiers.

setup.py

@@ -170,14 +170,16 @@ setup(
     long_description=long_desc,
     zip_safe=False,
     classifiers=[
-        'Development Status :: 4 - Beta',
+        'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
         'Environment :: Web Environment',
         'Intended Audience :: Developers',
+        'Intended Audience :: Education',
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Topic :: Documentation',
+        'Topic :: Text Processing',
         'Topic :: Utilities',
     ],
     platforms='any',