Merge branch 'dl/ForwardDiffExt' of https://github.com/JuliaMath/AbstractFFTs.jl into dl/ForwardDiffExt

Author: dlfivefifty

Project.toml

@@ -4,7 +4,6 @@ version = "1.6.0"
 
 [deps]
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
-ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"