added compat statement

Author: Brad Carman

Project.toml

@@ -11,7 +11,7 @@ Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
 
 [compat]
 IfElse = "0.1"
-ModelingToolkit = "8.26"
+ModelingToolkit = "8.49" #8.49 required for the Domain feauture
 Symbolics = "4.9, 5"
 julia = "1.6"