CompatHelper: bump compat for SpecialFunctions to 2 for package test, (keep existing compat) (#412)

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>
Co-authored-by: Théo Galy-Fajou <theo.galyfajou@gmail.com>
Co-authored-by: st-- <st--@users.noreply.github.com>

Author: 4 people

test/Project.toml

@@ -28,5 +28,5 @@ Kronecker = "0.4"
 LogExpFunctions = "0.2, 0.3"
 PDMats = "0.9, 0.10, 0.11"
 ReverseDiff = "1.2"
-SpecialFunctions = "0.10, 1"
+SpecialFunctions = "0.10, 1, 2"
 Zygote = "0.4, 0.5, 0.6"