Fix IndexStyle depwarns

Author: timholy

REQUIRE

@@ -1,2 +1,2 @@
 julia 0.5
-Compat 0.17.0
+Compat 0.19.0

src/MappedArrays.jl

@@ -54,7 +54,7 @@ Base.size(A::AbstractMappedArray) = size(A.data)
 Base.indices(A::AbstractMappedArray) = indices(A.data)
 parenttype{T,N,A,F}(::Type{ReadonlyMappedArray{T,N,A,F}}) = A
 parenttype{T,N,A,F,Finv}(::Type{MappedArray{T,N,A,F,Finv}}) = A
-Base.linearindexing{MA<:AbstractMappedArray}(::Type{MA}) = Base.linearindexing(parenttype(MA))
+@compat Base.IndexStyle{MA<:AbstractMappedArray}(::Type{MA}) = IndexStyle(parenttype(MA))
 
 @propagate_inbounds Base.getindex(A::AbstractMappedArray, i::Int...) = A.f(A.data[i...])
 @propagate_inbounds Base.setindex!{T}(A::MappedArray{T}, val::T, i::Int...) = A.data[i...] = A.finv(val)