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update changelog
0.5.4
Merge pull request #121 from ipa320/indigo_release_candidate

Indigo release candidate
catkin_lint'ing
Merge pull request #122 from ipa-fxm/indigo_dev

catkin_lint'ing
Merge branch 'indigo_dev' of https://github.com/ipa320/cob_common into indigo_dev