CompatHelper: bump compat for "SpecialFunctions" to "2" (#156)

* CompatHelper: bump compat for "SpecialFunctions" to "2"

* v0.13.1

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sheehan Olver <[email protected]>

Author: github-actions[bot]

Project.toml

@@ -1,6 +1,6 @@
 name = "FastTransforms"
 uuid = "057dd010-8810-581a-b7be-e3fc3b93f78c"
-version = "0.13.0"
+version = "0.13.1"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"
@@ -28,6 +28,6 @@ FastGaussQuadrature = "0.4"
 FastTransforms_jll = "0.5.1"
 FillArrays = "0.9, 0.10, 0.11, 0.12"
 Reexport = "0.2, 1.0"
-SpecialFunctions = "0.10, 1"
+SpecialFunctions = "0.10, 1, 2"
 ToeplitzMatrices = "0.6, 0.7"
 julia = "1.6"