Update README.md

Update README.md

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 ## discourse-graphviz
 
-Adds the [Viz.js](https://github.com/mdaines/viz.js) library to discourse.
+Adds [Graphviz](https://www.graphviz.org) capability to discourse.
 
 Topic discussing the plugin itself can be found here: https://meta.discourse.org/t/graphviz-plugin/97554
 

GitHub sha: a3f294f2

This commit appears in #1 which was merged by SamSaffron.