Ensure Travis CI build exits if build fails

Author: lukebakken

.travis.yml

@@ -34,5 +34,9 @@ before_script:
   - /bin/sh "$TRAVIS_BUILD_DIR/rabbitmq_server-$RABBITMQ_VERSION/sbin/rabbitmqctl" status
 
 script:
+  # See https://github.com/travis-ci/travis-ci/issues/1066 and https://github.com/pika/pika/pull/984#issuecomment-370565220
+  # as to why 'set -e' and 'set +e' are added here
+  - set -e
   - /bin/sh "$TRAVIS_BUILD_DIR/build.sh"
   - /bin/sh -c "RABBITMQ_RABBITMQCTL_PATH=$TRAVIS_BUILD_DIR/rabbitmq_server-$RABBITMQ_VERSION/sbin/rabbitmqctl $TRAVIS_BUILD_DIR/run-test.sh"
+  - set +e