fix link to ros

travis_custom/custom_before_install

@@ -11,7 +11,7 @@ curl http://robotpkg.openrobots.org/packages/debian/robotpkg.key | sudo apt-key
 
 # Add ros-hydro
 sudo sh -c "echo \"deb http://packages.ros.org/ros/ubuntu precise main\" > /etc/apt/sources.list.d/ros-latest.list"
-curl https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -O - | sudo apt-key add -
+curl https://raw.githubusercontent.com/ros/rosdistro/master/ros.key | sudo apt-key add -
 
 # show memory usage before install
 sudo free -m -t