Merge pull request #564 from nathanaelbosch/patch-1

Remove compat with AbstractTrees 0.3

Author: ChrisRackauckas

Project.toml

@@ -25,7 +25,7 @@ TimerOutputs = "a759f4b9-e2f1-59dc-863e-4aeb61b1ea8f"
 Unityper = "a7c27f48-0311-42f6-a7f8-2c11e75eb415"
 
 [compat]
-AbstractTrees = "0.3, 0.4"
+AbstractTrees = "0.4"
 Bijections = "0.1.2"
 ChainRulesCore = "1"
 Combinatorics = "1.0"