fix travis: format_map is python 3.2 or later only and ignore new rule W504 #636
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Using format_map breaks travis on python 2 (see also #602), e.g.: https://travis-ci.org/ros-infrastructure/rosdep/jobs/445522297
W504 was introduced in PyCQA/pycodestyle#502 it seems.
Makes travis on master fail also for python 3 https://travis-ci.org/ros-infrastructure/rosdep/jobs/445522297