Add Python 3.6, drop unsupported 2.6, 3.3

.travis.yml

@@ -7,17 +7,15 @@ python:
  - pypy
  - pypy3
  - 2.7
+ - 3.6
  - 3.5
- - 2.6
- - 3.3
  - 3.4
 
 install:
  - python setup.py install
  - pip install coverage
  - pip install pep8
  - pip install pyflakes
- - if [ "$TRAVIS_PYTHON_VERSION" == "2.6" ]; then pip install unittest2; fi
 
 script:
  - coverage run --include=warnaserror.py -m nose -vx tests/test_*.py

tests/test_fake.py

@@ -4,10 +4,7 @@
 """
 from __future__ import print_function, unicode_literals
 
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
+import unittest
 
 
 class TestFake(unittest.TestCase):

warnaserror.py

@@ -5,7 +5,7 @@
 
 
 class WarnAsError(Plugin):
-    """Treat warnings that occur DURIONG tests as errors."""
+    """Treat warnings that occur DURING tests as errors."""
     enabled = False
 
     def options(self, parser, env):