Mention graphviz dependency in README.md and CONTRIBUTING.md

Closes #322
Raku · Jan 6, 2016 · fc0732b · fc0732b
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -74,6 +74,7 @@ computer.  To do this you will need:
   - Rakudo (the Rakudo Perl 6 implementation)
   - Panda (the installer for third party Perl 6 modules)
   - `Pod::To::HTML` (Perl 6 module for converting Pod objects to HTML)
+  - [graphviz](http://www.graphviz.org/)
   - Mojolicious (optional; a Perl 5 web framework; it allows you to run a web
     app locally to display the docs)
   - pygmentize (optional; a program to add syntax highlighting to code

diff --git a/README.md b/README.md
@@ -25,6 +25,8 @@ To build the documentation web pages, simply run
 
     $ make html
 
+In addition to the Perl 6 dependencies, you need to have `graphviz` installed.
+
 After the pages have been generated, you can view them on your local
 computer by starting the included `app.pl` program: