avoid const assert to keep msrv

Author: ronnodas

src/arrays.rs

@@ -13,9 +13,8 @@ pub struct Arrays<I: Iterator, const N: usize> {
 
 impl<I: Iterator, const N: usize> Arrays<I, N> {
     pub(crate) fn new(iter: I) -> Self {
-        const {
-            assert!(N > 0);
-        }
+        // this is effectively assert!(N > 0);
+        const { N - 1 };
         // TODO should we use iter.fuse() instead? Otherwise remainder may behave strangely
         Self {
             iter,