Workflow PlanetUML format dump

In [Symfony 4.1](Symfony 4.1) new commands were added to export to the PlanetUML[fn:planetuml] format:

bin/console workflow:dump my_workflow —dump-format=puml | java -jar plantuml.jar -p > my_workflow.png

Footnotes

[fn:planetuml]http://plantuml.com/