Travis config updated to fix build/test breakage.

Author: rc0r

.travis.yml

@@ -3,6 +3,8 @@ python:
       - "3.4"
       - "3.5"
 before_install:
+      - sudo apt-get -qq update
+      - sudo apt-get install -y gdb
       - pip install pytest pytest-cov
       - pip install coveralls
 install: