Support DataStructures@0.19 (#2796)

Author: odow

Project.toml

@@ -23,7 +23,7 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 BenchmarkTools = "1"
 CodecBzip2 = "0.6, 0.7, 0.8"
 CodecZlib = "0.6, 0.7"
-DataStructures = "0.18"
+DataStructures = "0.18, 0.19"
 ForwardDiff = "0.10, 1"
 JSON3 = "1"
 JSONSchema = "1"