allow Interpolations 0.13

Author: rdeits

Project.toml

@@ -10,7 +10,7 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 
 [compat]
-Interpolations = "0.9, 0.10, 0.11, 0.12"
+Interpolations = "0.9, 0.10, 0.11, 0.12, 0.13"
 IterTools = "1"
 StaticArrays = "0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11, 0.12, 1"
 julia = "1"