Drop support for EOL Python 3.3

Author: hugovk

Diff for: .travis.yml

@@ -1,7 +1,6 @@
 language: python
 python:
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"

Diff for: setup.py

@@ -80,7 +80,7 @@ def _stamp_version(filename):
     package_data={'git.test': ['fixtures/*']},
     package_dir={'git': 'git'},
     license="BSD License",
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     requires=['gitdb2 (>=2.0.0)'],
     install_requires=install_requires,
     test_requirements=test_requires + install_requires,
@@ -107,7 +107,6 @@ def _stamp_version(filename):
         "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",

Diff for: tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py33,py34,py35,py36,flake8
+envlist = py27,py34,py35,py36,flake8
 
 [testenv]
 commands = nosetests {posargs}