add pygraphviz to reqs_dev

b1e8e232 · hagrid67 · 7bd4c19e · b1e8e232
Commit b1e8e232 authored 4 years ago by hagrid67
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -21,3 +21,4 @@ attrs
 gym==0.14.0
 networkx
 ipycanvas
+pygraphviz