Modernize supported Python versions

Also rewrite .travis.yml to use zope-testrunner directly, avoiding
tox.

.travis.yml

@@ -1,12 +1,16 @@
 language: python
-sudo: false
-env:
-    - TOXENV=py26
-    - TOXENV=py27
-    - TOXENV=py33
+dist: xenial
+python:
+  - 2.7
+  - 3.5
+  - 3.6
+  - 3.7
 install:
-    - travis_retry pip install tox
+  - pip install zope.testrunner coverage coveralls
+  - pip install -e .[test]
 script:
-    - tox
+  - coverage run -m zope.testrunner --test-path=src -vc
+after_success:
+  - coveralls
 notifications:
-    email: false
+  email: false

CHANGES.txt

@@ -5,7 +5,9 @@ CHANGES
 2.0.1 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Added support for Python 3.5, 3.6, and 3.7.
+
+- Dropped support for Python 2.6, 3.3, and 3.4.
 
 
 2.0.0 (2015-11-09)
@@ -37,12 +39,14 @@ CHANGES
 - Using Python's ``doctest`` module instead of depreacted
   ``zope.testing.doctest``.
 
+
 1.1.0 (2009-05-29)
 ------------------
 
 - Feature: Added ability to register a Null-adapter as a breadcrumb. A
   null-breadcrumb will cause the item not to be displayed in the breadcrumbs.
 
+
 1.0.3 (2008-12-13)
 ------------------
 

setup.py

@@ -43,16 +43,18 @@ def read(*rnames):
         'License :: OSI Approved :: Zope Public License',
         '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 :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
         'Natural Language :: English',
         'Operating System :: OS Independent',
         'Environment :: Web Environment',
         'Topic :: Internet :: WWW/HTTP',
-        'Framework :: Zope :: 3'],
+        'Framework :: Zope :: 3',
+    ],
     url = 'http://pypi.python.org/pypi/z3c.breadcrumb',
     packages = find_packages('src'),
     package_dir = {'':'src'},

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py26,py27,py33
+    py27,py35,py36,py37
 
 [testenv]
 commands =