Merge branch 'master' into migration

Author: khosravipasha

Project.toml

@@ -19,7 +19,7 @@ TikzGraphs = "b4f28e30-c73f-5eaf-a395-8a9db949a742"
 CUDA = "3.8.1, 4, 5"
 ChowLiuTrees = "0.1.1"
 CodecZlib = "0.7"
-DirectedAcyclicGraphs = "0.2"
+DirectedAcyclicGraphs = "0.1.3, 0.2"
 Graphs = "1"
 Lerche = "0.5"
 MetaGraphs = "0.7"