PlantUML v7987

[PlantUML](http://plantuml.sourceforge.net/) is a tool that let you write UML with a simple language and generate PNG/SVG images (and even ASCII art diagrams). It’s well maintained (the last version was released today, and the previous one was in November) and [widely used](https://github.com/search?p=1&q=plantuml&ref=searchresults&type=Code).