"setup.py": Fix and update trove classifers.

setup.py

@@ -13,20 +13,21 @@
 setup(
   author = "Damien Dart",
   author_email = "damiendart@pobox.com",
-  classifiers = (
+  classifiers = [
     "Development Status :: 3 - Alpha",
     "Intended Audience :: Developers",
     "License :: Public Domain",
     "Programming Language :: Python",
-    # TODO: Test "nfsnapi" with other versions of Python.
+    "Programming Language :: Python :: 2",
     "Programming Language :: Python :: 2.7",
+    "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.3",
     "Programming Language :: Python :: 3.4",
     "Programming Language :: Python :: 3.5",
     "Operating System :: OS Independent",
     "Topic :: Internet :: WWW/HTTP",
     "Topic :: Software Development :: Libraries :: Python Modules"
-  ),
+  ],
   description = nfsnapi.__doc__.split("\n", 1)[0],
   keywords = "nearlyfreespeech nfsn",
   long_description = open("README.txt").read(),