try to test python 2.7 and 3.5

.travis.yml

@@ -1,6 +1,10 @@
-language: cpp
+language: python
 sudo: false
 
+python:
+  - 2.7
+  - 3.5
+
 matrix:
   include:
 
@@ -49,7 +53,7 @@ script:
     # pep8 tests
   - pep8 --ignore E501 update.py
   - pep8 --ignore E501,E265 autocmake
-#   # unit tests
+    # unit tests
   - py.test -vv autocmake/*
   - py.test -vv test/test.py