Siffworkflow 2.0.0

Pleased to announce that version 2.0.0 of the SpiffWorkflow Library is officially released. SpiffWorkflow is a Visual Workflow Engine - draw it and run it. Version 2.0 is in preparation for a very soon to be released wrapper that turns SpiffWorkflow into a turnkey workflow engine that anyone can use to build, test, and execute flow-chart like diagrams that can handle things like manual approval processes, system integration, data pipelines, hell, you can get this thing to write a poem to your mom every year on mothers day, and follow it up with discord message reminding you to call her.