Updated version of d3-sankey-path library, with standalone library to append arrows.
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forked from tomshanley's block: Sankey with circular links
forked from tomshanley's block: Sankey - slack question
forked from noblemillie's block: Sankey w circular links
https://d3js.org/d3.v4.min.js
https://unpkg.com/d3-sankey-circular@0.28.0