Declare to PyPI and tools that djqscsv supports Python 3 (#109)

Declare to PyPI and tools that djqscsv supports Python 3

Author: jwalgran

setup.py

@@ -16,6 +16,8 @@
         "Development Status :: 4 - Beta",
         "Intended Audience :: Developers",
         "Programming Language :: Python",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.5",
         "Environment :: Plugins",
         "Framework :: Django",
         "License :: OSI Approved :: GNU General Public License (GPL)"