Update src/prelude.jl

Co-authored-by: David Widmann <devmotion@users.noreply.github.com>

Author: mcabbott

src/prelude.jl

@@ -73,6 +73,3 @@ end
 
 # This allows us to call `Base.require_one_based_indexing` in `gradient!` etc:
 Base.has_offset_axes(::DiffResults.DiffResult) = false
-# And this is only needed for VERSION < v"1.2"
-require_one_based_indexing(A...) = !Base.has_offset_axes(A...) || throw(ArgumentError(
-    "offset arrays are not supported but got an array with index other than 1"))