Package maintenance

- add compatibility note to Changelog
- add PyPI trove classifiers
- add Python 3 to travis tests

.travis.yml

@@ -3,10 +3,17 @@ sudo: false
 dist: trusty
 python:
     - 2.7
+    - 3.4
+    - 3.5
+    - 3.6
 install:
     - python bootstrap.py
     - bin/buildout
 script:
     - bin/test -v1
 notifications:
     email: false
+cache:
+  pip: true
+  directories:
+    - eggs/

CHANGES.rst

@@ -4,6 +4,8 @@ Changelog
 3.0.0 (unreleased)
 ------------------
 
+- Python 3 compatibility
+
 
 3.0.0b1 (2017-05-03)
 --------------------

setup.py

@@ -34,6 +34,24 @@
     packages=find_packages('src'),
     namespace_packages=['Products', 'Shared', 'Shared.DC'],
     package_dir={'': 'src'},
+    classifiers=[
+        "Development Status :: 6 - Mature",
+        "Environment :: Web Environment",
+        "Framework :: Zope2",
+        "License :: OSI Approved :: Zope Public License",
+        "Operating System :: OS Independent",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: Implementation :: CPython",
+        "Programming Language :: Python :: Implementation :: PyPy",
+		"Topic :: Database",
+		"Topic :: Database :: Front-Ends",
+    ],
     install_requires=[
         'setuptools',
         'six',