v2.2.0

• Add SnowStick, a reading tracker integrated with DotGraph
• Support configuration using the DotGraphSettings passage, a safer and more flexible spot than StorySettings (though the latter is still supported)
• Support for viewing a story by URL, a quicker way than by loading the story and this format into Twine or a compiler (which have always been possible)
• Add Graphviz engine options
• Update to the latest viz.js to fix some special character issues