IntoIterator for &'a CheeseSlice about soa-derive

[inv2004]

impl<'a> IntoIterator for &'a CheeseSlice<'a> {
  type Item = CheeseRef<'a>;
  type IntoIter = __detail_iter_cheese::Iter<'a>;

  fn into_iter(self) -> Self::IntoIter {
    self.iter()
  }
}

[inv2004]

#11

[Luthaf]

Yeah, this was an oversight from my side, we can add this implementation.

[Luthaf]

I just released version 0.6.1 with this change.