Merge pull request #137 from davidhuser/drop-python-3.3

Drop Python 3.3 support to allow dependency updates

.travis.yml

@@ -26,7 +26,6 @@ language: python
 python:
 - 2.6
 - 2.7
-- 3.3
 - 3.4
 - 3.5
 - 3.6

CONTRIBUTING.rst

@@ -101,7 +101,7 @@ Before you submit a pull request, check that it meets these guidelines:
 2. If the pull request adds functionality, the docs should be updated. Put
    your new functionality into a function with a docstring, and add the
    feature to the list in README.rst.
-3. The pull request should work for Python 2.6, 2.7, 3.3, 3.4 and 3.5, and for PyPy. Check
+3. The pull request should work for Python 2.6, 2.7, 3.4, 3.5, 3.6 and for PyPy. Check
    https://travis-ci.org/metachris/logzero/pull_requests
    and make sure that the tests pass for all supported Python versions.
 

setup.py

@@ -33,7 +33,6 @@
         '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',