Update static.jl for AbstractArrays

Author: pkofod

src/static.jl

@@ -28,9 +28,9 @@ function (ls::Static)(df, x, s, x_scratch, lsr, alpha, mayterminate)
 end
 
 function _static!(df,
-                x::Array{T},
-                s::Array{T},
-                x_scratch::Array{T},
+                x::AbstractArray{T},
+                s::AbstractArray{T},
+                x_scratch::AbstractArray{T},
                 lsr::LineSearchResults,
                 alpha::Real = 1.0,
                 mayterminate::Bool = false) where T