Update arbor/util/range.hpp

Co-authored-by: boeschf <[email protected]>

arbor/util/range.hpp

@@ -157,6 +157,7 @@ range<T, T> range_n(T t, size_t n) {
 template <typename Seq>
 auto canonical_view(Seq&& s) {
  using std::begin;
+ using std::end;
  auto b = begin(s);
  auto e = end(s);
  return make_range(make_sentinel_iterator(b, e), make_sentinel_end(b, e));