Merge pull request #1828 from scrapy/py3-classifiers

[MRG+1] declare Python 3 support in setup.py

setup.py

@@ -32,6 +32,10 @@ setup(
         'Programming Language :: 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',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Software Development :: Libraries :: Application Frameworks',
         'Topic :: Software Development :: Libraries :: Python Modules',