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![Heinrich Schuchardt](https://secure.gravatar.com/avatar/3c0ac3a4aac38bc184c7b6c1e45e98e1.jpg?s=96&d=mm)
Heinrich Schuchardt committed bb9a76ea67f
travis: build HTML docs Several patches delivered incorrect restructured text as documentation. We should be able to discover this in Travis CI. Provide a build step for 'make htmldocs'. Add required package graphviz. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>