pytest: for now run tests only on py 2.7

Author: ergo

.travis.yml

@@ -17,21 +17,9 @@ matrix:
     - python: "2.7"
       env:
 
-    - python: "3.3"
-      env:
-
-    - python: "3.4"
-      env:
-
-    - python: "3.5"
-      env:
-
     - python: "pypy"
       env:
 
-    - python: "pypy3"
-      env:
-
 install:
  - pip install flake8 rstcheck