CompatHelper: bump compat for DataStructures to 0.19, (keep existing compat) (#201)

Author: algebraicjuliabot

Project.toml

@@ -20,7 +20,7 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 AlgebraicInterfaces = "0.1.4"
 Colors = "0.12, 0.13"
 Crayons = "4"
-DataStructures = "0.18"
+DataStructures = "0.18, 0.19"
 JSON = "0.21"
 MLStyle = "0.4"
 Reexport = "1"