add compat

mileslucas · mileslucas · commit 7ea628d64b30 · 2021-09-15T11:06:21.000-10:00
diff --git a/Project.toml b/Project.toml
@@ -13,6 +13,7 @@ SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
 [compat]
+ChainRulesCore = "1"
 CoordinateTransformations = "0.6"
 Distances = "0.10"
 KeywordCalls = "0.2"
