Update maps.jl

Author: DanielVandH

src/maps.jl

@@ -10,7 +10,6 @@ is `union(m)`.
 Maps must also overload `invmap` to give the inverse of the map, which
 is equivalent to `invmap(m)[x] == findfirst(isequal(x), m)`.
 """
-
 abstract type Map{T} <: AbstractQuasiVector{T} end
 
 invmap(M::Map) = error("Overload invmap(::$(typeof(M)))")
@@ -170,4 +169,4 @@ show(io::IO, P::Union{AffineMappedQuasiVector,AffineMappedQuasiMatrix}) = print(
 function summary(io::IO, P::Union{AffineMappedQuasiVector,AffineMappedQuasiMatrix})
     summary(io, parent(P))
     print(io, " affine mapped to $(parentindices(P)[1].x.domain)")
-end
+end