Update .travis.yml
Update .travis.yml

Re-enabling slack notifications.
odin-detector/odin-data,odin-detector/odin-data,percival-detector/odin-data,odin-detector/odin-data,odin-detector/odin-data,percival-detector/odin-data,percival-detector/odin-data,odin-detector/odin-data,percival-detector/odin-data,odin-detector/odin-data,percival-detector/odin-data,percival-detector/odin-data,percival-detector/odin-data,odin-detector/odin-data