Merge pull request #969 from LaurentMazare/clippy-fixes2

Clippy fixes.

Author: LaurentMazare

src/tensor/npy.rs

@@ -72,7 +72,7 @@ impl Header {
         let mut parts: Vec<String> = vec![];
         let mut start_index = 0usize;
         let mut cnt_parenthesis = 0i64;
-        for (index, c) in header.chars().enumerate() {
+        for (index, c) in header.char_indices() {
             match c {
                 '(' => cnt_parenthesis += 1,
                 ')' => cnt_parenthesis -= 1,