attempt to fix build

Author: Eduard Iskandarov

.travis.yml

@@ -1,18 +1,24 @@
+sudo: false
+
 language: python
-python:
-  - "2.6"
-  - "2.7"
-  - "3.5"
-  - "3.6"
+
+matrix:
+  include:
+    - python: 3.6
+      env: TOXENV=py36
+    - python: 3.5
+      env: TOXENV=py35
+    - python: 2.7
+      env: TOXENV=py27
+    - python: 2.6
+      env: TOXENV=py26
+
+
 install:
   - pip install tox coveralls
-# command to run tests
+
 script:
   tox
-env:
-  - TOXENV=py26
-  - TOXENV=py27
-  - TOXENV=py35
-  - TOXENV=py36
+
 after_success:
   coveralls