Disable wrning tests for python2.

ResourceWarning is not known to python2, so don't run with any warning
flags for python 2.7 since it provides no useful info.

Author: rouilj

.travis.yml

@@ -146,14 +146,16 @@ before_script:
 script:
   - PATH=$VIRTUAL_ENV/bin:$PATH
   - export LD_LIBRARY_PATH=$VIRTUAL_ENV/lib:$LD_LIBRARY_PATH
-  - py.test 
+  - [[ $TRAVIS_PYTHON_VERSION != "2."* ]] && py.test 
     -W default
     -W "ignore:SelectableGroups:DeprecationWarning" 
     -W "ignore:the imp module:DeprecationWarning:gpg.gpgme:15" 
     -W "ignore:'U' mode::docutils.io" 
     -W "ignore:unclosed:ResourceWarning:roundup.roundup.demo" 
     -W "ignore:unclosed file:ResourceWarning:enum" 
     -v --maxfail=20 test/ --cov=roundup
-  
+  - [[ $TRAVIS_PYTHON_VERSION == "2."*  ]] && py.test 
+    -v --maxfail=20 test/ --cov=roundup
+
 after_success:
   - codecov