Discontinue official support for Python 3.3

(testing failed due to wheel now requiring Python >= 3.4)

Also run flake8 in latest Python 3.6
(3.7 is not supported on Travis yet)

.travis.yml

@@ -5,7 +5,6 @@ language: python
 python:
   - pypy
   - 2.7
-  - 3.3
   - 3.4
   - 3.5
   - 3.6
@@ -19,7 +18,7 @@ matrix:
   fast_finish: true
 
   include:
-    - python: 3.5
+    - python: 3.6
       env:
       - TOXENV=flake8
 

README.md

@@ -20,7 +20,7 @@ The project moved to GitLab in 2013 an is now maintained by Tobias "oberstet" Ob
 
 ## Installation
 
-Scour requires [Python](https://www.python.org) 2.7 or 3.3+. Further, for installation, [pip](https://pip.pypa.io) should be used.
+Scour requires [Python](https://www.python.org) 2.7 or 3.4+. Further, for installation, [pip](https://pip.pypa.io) should be used.
 
 To install the [latest release](https://pypi.python.org/pypi/scour) of Scour from PyPI:
 

tox.ini

@@ -2,7 +2,6 @@
 envlist =
     pypy
     py27
-    py33
     py34
     py35
     py36