(travis) fix typo

Author: MatthijsBurgh

.travis.yml

@@ -7,7 +7,7 @@ install:
   - git -C ~/.tue checkout feature/ros_deps
   - tue-get install tue-documentation-github --no-ros-deps --doc-depend --branch=fix/docs
   - MSG_PKGS=($(./.ci/get_message_packages.py base_local_planner costmap_2d)) # Skip base_local_planner and costmap_2d as these take too much time
-  - echo "MSG_PKGS= ${MSG_PKGS[@]"
+  - echo "MSG_PKGS= ${MSG_PKGS[@]}"
   - MSG_TARGETS=(${MSG_PKGS[@]/#/ros-})
   - tue-get install ros-python_orocos_kdl ${MSG_TARGETS[@]} # Needs to be installed fully as it needs to be build to generate docs
   - export ROS_PACKAGE_PATH=""