fixing travis

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
-  - "2.6"
   - "2.7"
-script: ./tox
+script: tox
 

setup.py

@@ -30,5 +30,5 @@ setup(
     package_dir={'': 'src'},
     include_package_data=True,
     install_requires=['docutils'],
-    tests_require=['virtualenv>=1.8.4', 'pytest'],
+    tests_require=['virtualenv', 'pytest'],
 )