Drop support for Python 3.3

.travis.yml

@@ -3,7 +3,6 @@ language: python
 cache: pip
 python:
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.5-dev"
@@ -16,6 +15,6 @@ install:
   - pip install codecov
 script:
   - tox
-  - if [[ $TRAVIS_PYTHON_VERSION != 2.6 ]]; then pre-commit run --all-files; fi
+  - pre-commit run --all-files
 after_success:
   - codecov

setup.py

@@ -39,7 +39,6 @@ setup(
         'Programming Language :: Python :: 2',
         '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',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py33,py34,py35,py36,pycodestyle,isort-check
+envlist = py27,py34,py35,py36,pycodestyle,isort-check
 
 [testenv]
 deps =
@@ -36,7 +36,6 @@ commands =
 [travis]
 python =
   2.7: py27, pycodestyle
-  3.3: py33, pycodestyle
   3.4: py34, pycodestyle
   3.5: py35, pycodestyle
   3.6: py36, pycodestyle