TST enable parsel-specific tests on Travis

Author: kmike

.travis.yml

@@ -9,10 +9,14 @@ matrix:
   include:
     - python: 2.7
       env: TOXENV=py27
+    - python: 2.7
+      env: TOXENV=py27-parsel
     - python: 3.5
       env: TOXENV=py35
     - python: 3.6
       env: TOXENV=py36
+    - python: 3.6
+      env: TOXENV=py36-parsel
     - python: 3.7
       env: TOXENV=py37
       dist: xenial

tox.ini

@@ -1,11 +1,11 @@
 [tox]
-envlist = py27,py35,py36,py37,{py2,py3}-parsel
+envlist = py27,py35,py36,py37,{py27,py36}-parsel
 
 [testenv]
 deps =
     pytest
     pytest-cov
-    {py2,py3}-parsel: parsel
+    {py27,py36}-parsel: parsel
 
 commands =
     pip install -U pip