Update DataStructures compatibility to include 0.19

Author: blegat

Project.toml

@@ -19,7 +19,7 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 
 [compat]
 Colors = "0.9, 0.10, 0.11, 0.12, 0.13"
-DataStructures = "0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18"
+DataStructures = "0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19"
 IterTools = "1"
 JSON = "0.18, 0.19, 0.20, 0.21"
 Measures = "0.3"