Send to Coveralls only on success

.travis.yml

@@ -33,7 +33,7 @@ script:
 - find tilecloud_chain -name \*.py | xargs ./buildout/bin/flake8 --max-line-length=120
 - ./buildout/bin/python setup.py nosetests
 
-after_script:
+after_success:
   # Report coverage results to coveralls.io
   - pip install coveralls
   - coveralls