message: fixing code for AppVeyor
diff: @@ -2203,7 +2203,7 @@ get_reindexed_view(const char *col_to_be_index, const char *old_index_name) {
  const size_type new_idx_s = new_idx.size();
  result.indices_ = typename DataFrameView<T>::IndexVecType();
  - result.indices_.set_begin_end_special(&*(new_idx.begin()),
  + result.indices_.set_begin_end_special(&(new_idx.front()),
  &(new_idx.back()));
  if (old_index_name) {
  auto &curr_idx = get_index();
  @@ -2247,7 +2247,7 @@ get_reindexed_view(const char *col_to_be_index,
  const size_type new_idx_s = new_idx.size();
  result.indices_ = typename DataFrameConstView<T>::IndexVecType();
  - result.indices_.set_begin_end_special(&*(new_idx.begin()),
  + result.indices_.set_begin_end_special(&(new_idx.front()),
  &(new_idx.back()));
  if (old_index_name) {
  auto &curr_idx = get_index();
  