Fix Clippy errors rust-ndarray#642

Author: alex179ohm

src/dimension/dim.rs

@@ -44,7 +44,7 @@ pub struct Dim<I: ?Sized> {
 impl<I> Dim<I> {
     /// Private constructor and accessors for Dim
     pub(crate) fn new(index: I) -> Dim<I> {
-        Dim { index: index }
+        Dim { index }
     }
     #[inline(always)]
     pub(crate) fn ix(&self) -> &I {

src/dimension/dynindeximpl.rs

@@ -221,7 +221,7 @@ impl IxDyn {
     /// Create a new dimension value with `n` axes, all zeros
     #[inline]
     pub fn zeros(n: usize) -> IxDyn {
-        const ZEROS: &'static [usize] = &[0; 4];
+        const ZEROS: &[usize] = &[0; 4];
         if n <= ZEROS.len() {
             Dim(&ZEROS[..n])
         } else {