ggplot2_histogram: revision graph

graph

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planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/ggplot2 commit e239436217a7b5099ccdfc13ea5dff9a981f47eb draft
Tue, 02 Apr 2019 10:44:50 -0400, by iuc
planemo upload for repository https://github.com/galaxyproject/tools-iuc/tree/master/tools/ggplot2 commit d1da3cf72a15d88fc265edc5d64e6b820b6a2b2f draft
Sun, 24 Mar 2019 13:21:52 -0400, by iuc

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