As requested by Clint Adams.
1 patch for repository http://darcs.net/screened:
patch 60d9659d9b6af335d86ef4f2261aebe9fe67c27b
Author: Ben Franksen <ben.franksen@online.de>
Date: Tue May 29 12:19:19 CEST 2018
* increase upper bound for graphviz dependency to 2999.20.1