python 3.4 -> default in travis

Kawasaki-Robotics / khi_robot

ROS KHI robot meta-package

http://wiki.ros.org/khi_robot

BSD 3-Clause "New" or "Revised" License

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Closed d-nakamichi closed 4 years ago

d-nakamichi commented 4 years ago

Now python 3.4 cannot be used in travis because of dependency of PyYAML. This PR changes python's version from 3.4 to default (currently 3.6)