add graphviz to install docs
@@ -110,15 +110,15 @@ development tools quite a breeze. Follow
-Get a version control system - Git, Git LFS, and Yarn
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+Install contributor system dependencies
+---------------------------------------
Use Chocolatey within an administrator command prompt to install Git,
-Git LFS, and yarn like so:
+Git LFS, yarn, and graphviz like so:
.. code:: bash
- choco install git yarn nodejs
+ choco install git yarn nodejs graphviz
