Drop testing for 2.6 and 3.3. Add 3.6.

Via discussion pallets/meta#24
diff --git a/setup.py b/setup.py
index e6c5c83..12d3fb0 100755
--- a/setup.py
+++ b/setup.py
@@ -79,10 +79,12 @@
     setup(
         name='MarkupSafe',
         version=version,
-        url='http://github.com/pallets/markupsafe',
+        url='https://www.palletsprojects.com/p/markupsafe/',
         license='BSD',
         author='Armin Ronacher',
         author_email='armin.ronacher@active-4.com',
+        maintainer='Pallets team',
+        maintainer_email='contact@palletsprojects.com',
         description='Implements a XML/HTML/XHTML Markup safe string for Python',
         long_description=readme,
         zip_safe=False,
@@ -94,10 +96,8 @@
             'Operating System :: OS Independent',
             'Programming Language :: Python',
             'Programming Language :: Python :: 2',
-            'Programming Language :: Python :: 2.6',
             'Programming Language :: Python :: 2.7',
             'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3.3',
             'Programming Language :: Python :: 3.4',
             'Programming Language :: Python :: 3.5',
             'Programming Language :: Python :: 3.6',