Drop Python 3.3, add Python 3.6 and 3.7

Author: sethmlarson

.travis.yml

@@ -9,15 +9,19 @@ matrix:
   include:
     - python: 2.7
       env: TOXENV=py27
-    - python: 3.3
-      env: TOXENV=py33
     - python: 3.4
       env: TOXENV=py34
     - python: 3.5
       env: TOXENV=py35
+    - python: 3.6
+      env: TOXENV=py36
+    - python: 3.7
+      env: TOXENV=py37
+      dist: xenial
+      sudo: true
     - python: pypy
       env: TOXENV=pypy
-    - python: 3.5
+    - python: 3.6
       env: TOXENV=flake8
     #- env: TOXENV=docs
 

setup.py

@@ -37,9 +37,9 @@
         'Programming Language :: Python',
         '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',
+        'Programming Language :: Python :: 3.7',
     ),
 )