Suppress DeprecationWarning in py27.

Author: johnthagen

.travis.yml

@@ -12,6 +12,6 @@ before_script:
   - flake8 --max-line-length=99 --import-order-style=google --application-import-names=cpplint_junit
   - pylint -E cpplint_junit.py test.py
 script:
-  python -Werror -m coverage run test.py
+  python -Werror -Wignore::DeprecationWarning -m coverage run test.py
 after_success:
   codecov