Remove Django 1.6 from test matrix

.travis.yml

@@ -13,11 +13,6 @@ env:
     - TOX_ENV=py33-django17
     - TOX_ENV=py32-django17
     - TOX_ENV=py27-django17
-    - TOX_ENV=py34-django16
-    - TOX_ENV=py33-django16
-    - TOX_ENV=py32-django16
-    - TOX_ENV=py27-django16
-    - TOX_ENV=py26-django16
     - TOX_ENV=py27-djangomaster
     - TOX_ENV=py34-djangomaster
     - TOX_ENV=py35-djangomaster

tox.ini

@@ -4,13 +4,11 @@ addopts=--tb=short
 [tox]
 envlist =
        py27-{lint,docs},
-       {py26,py27,py32,py33,py34}-django16,
        {py27,py32,py33,py34}-django{17,18},
        {py27,py34,py35}-django{master}
 
 [testenv]
 basepython =
-            py26: python2.6
             py27: python2.7
             py32: python3.2
             py33: python3.3
@@ -21,7 +19,6 @@ commands = ./runtests.py --fast {posargs} --coverage
 setenv =
        PYTHONDONTWRITEBYTECODE=1
 deps =
-       django16: Django==1.6.3  # Should track minimum supported
        django17: Django==1.7.10  # Should track maximum supported
        django18: Django==1.8.4  # Should track maximum supported
        djangomaster: https://github.com/django/django/archive/master.tar.gz