Update Project.toml

Author: ChrisRackauckas

Project.toml

@@ -1,7 +1,7 @@
 name = "SymbolicNumericIntegration"
 uuid = "78aadeae-fbc0-11eb-17b6-c7ec0477ba9e"
 authors = ["Shahriar Iravanian <siravan@svtsim.com>"]
-version = "1.9.2"
+version = "1.9.1"
 
 [deps]
 DataDrivenDiffEq = "2445eb08-9709-466a-b3fc-47e12bd697a2"
@@ -20,6 +20,7 @@ DataDrivenDiffEq = "1.5"
 DataDrivenSparse = "0.1.2"
 DataStructures = "0.18.13"
 LinearAlgebra = "<0.0.1, 1"
+ForwardDiff = "0.10, 1"
 SpecialFunctions = "2"
 Statistics = "<0.0.1, 1"
 SymbolicUtils = "2.1, 3"