Removing python 3.3 from the travis build.

.travis.yml

@@ -2,7 +2,6 @@ language: python
 dist: trusty
 python:
   - 2.7
-  - 3.3
   - 3.4
   - 3.5
   - 3.6

setup.py

@@ -74,7 +74,6 @@ setuptools.setup(
         'Operating System :: POSIX',
         'Natural Language :: English',
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',