Alpha pre-multiplication u16 bugfix

src/neon/alpha_u16.rs

@@ -26,7 +26,7 @@
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-use crate::alpha_handle_u16::premultiply_alpha_rgba_row;
+use crate::alpha_handle_u16::{premultiply_alpha_rgba_row, unpremultiply_alpha_rgba_row};
 use rayon::iter::{IndexedParallelIterator, ParallelIterator};
 use rayon::prelude::{ParallelSlice, ParallelSliceMut};
 use rayon::ThreadPool;