Let's try something entirely different

I see that tox-travis has a workaround[*] for the Travis CI
pypy3.3-5.2-alpah1 alpha SNAFU (where 'pypy3' on $PATH is pypy3-2.4.0,
but 'python' on $PATH is pypy3.3-5.2-alpha1).

[*] https://github.com/ryanhiebert/tox-travis/blob/087c7e528f0e2f5606f729b9014d455c7d6cff97/src/tox_travis/toxenv.py#L42-L49

.travis.yml

@@ -1,20 +1,21 @@
 sudo: false
 language: python
+python:
+  - 2.7
+  - 3.3
+  - 3.4
+  - 3.5
+  - 3.6
+  - pypy
+  - pypy3.3-5.2-alpha1
 matrix:
   include:
-    - python: 3.5
-      env: TOXENV=py35
-    - python: pypy3.3-5.2-alpha1
-      env: TOXENV=pypy3
-      ##env:
-      ##    - TOXENV=py27
-      ##    - TOXENV=py27-subunit
-      ##    - TOXENV=pypy
-      ##    - TOXENV=pypy-subunit
-      ##    - TOXENV=py33
-      ##    - TOXENV=py34
+    - python: 2.7
+      env: TOXENV=py27-subunit
+    - python: pypy
+      env: TOXENV=pypy-subunit
 install:
-    - pip install -U pip setuptools tox virtualenv
+    - pip install tox-travis
 script:
     - tox
 notifications: