Update list of package classifiers.

Author: pglombardo

setup.py

@@ -23,9 +23,13 @@
       test_suite='nose.collector',
       keywords=['performance', 'opentracing', 'metrics', 'monitoring'],
       classifiers=[
-        'Development Status :: 4 - Beta',
+        'Development Status :: 5 - Production/Stable',
+        'Framework :: Django',
+        'Framework :: Flask',
         'Intended Audience :: Developers',
         'Intended Audience :: Information Technology',
+        'Intended Audience :: Science/Research',
+        'Intended Audience :: System Administrators',
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
@@ -34,6 +38,7 @@
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Topic :: Internet :: WWW/HTTP :: WSGI :: Middleware',
         'Topic :: System :: Monitoring',
         'Topic :: System :: Networking :: Monitoring',
         'Topic :: Software Development :: Libraries :: Python Modules'])