face_detector is released, so remove .travis.rosinstall.noetic . add test to check with latest pyyaml from pip #87

Job	Run time
ros (indigo, jskrobotics/ros-ubuntu:14.04, sudo pip install virtualenv==15.1.0, true)	10m 11s
ros (kinetic, ubuntu:16.04, pip install --user matplotlib==2.2.5)	16m 7s
ros (melodic, ubuntu:18.04)	18m 2s
ros (noetic, ubuntu:20.04)	21m 2s
ros (noetic, ubuntu:20.04, pip3 install --user pyyaml)	20m 1s
	1h 25m 23s

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