pair down circle versions

circle.yml

@@ -1,11 +1,9 @@
 machine:
   post:
-    - pyenv global 2.7.10 3.3.3 3.4.3 3.5.0
+    - pyenv global 2.7.10 3.6.2
   environment:
     TOX_PYTHON_27: python2.7
-    TOX_PYTHON_33: python3.3
-    TOX_PYTHON_34: python3.4
-    TOX_PYTHON_35: python3.5
+    TOX_PYTHON_36: python3.6
 
 
 dependencies:

tox.ini

@@ -1,30 +1,20 @@
 [tox]
-envlist = py27,py33,py34,py35
+envlist = py27,py36
 
 [testenv]
 deps = -rdev-requirements.txt
-passenv=TOX_*
+passenv =
+  HOME
+  DISPLAY
 
 [testenv:py27]
-basepython={env:TOX_PYTHON_35}
+basepython={env:TOX_PYTHON_27}
 commands =
     python --version
     python -m unittest discover -s tests/
 
-[testenv:py33]
-basepython={env:TOX_PYTHON_33}
-commands =
-    python --version
-    python -m unittest discover -s tests/
-
-[testenv:py34]
-basepython={env:TOX_PYTHON_34}
-commands =
-    python --version
-    python -m unittest discover -s tests/
-
-[testenv:py35]
-basepython={env:TOX_PYTHON_35}
+[testenv:py36]
+basepython={env:TOX_PYTHON_36}
 commands =
     python --version
     python -m unittest discover -s tests/