CompatHelper: bump compat for JSON to 1, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -60,7 +60,7 @@ ImageTransformations = "0.9, 0.10"
 Images = "0.24, 0.25, 0.26"
 IndexedTables = "1.0"
 JLD2 = "0.5"
-JSON = "0.21"
+JSON = "0.21, 1"
 JSON3 = "1.14"
 MacroTools = "0.5"
 OnlineStats = "1.7"