range-zip-with-len: make lint adhere to lint message convention

clippy_lints/src/ranges.rs

@@ -160,7 +160,7 @@ impl<'tcx> LateLintPass<'tcx> for Ranges {
                          span_lint(cx,
                                    RANGE_ZIP_WITH_LEN,
                                    expr.span,
-                                   &format!("It is more idiomatic to use `{}.iter().enumerate()`",
+                                   &format!("it is more idiomatic to use `{}.iter().enumerate()`",
                                             snippet(cx, iter_args[0].span, "_")));
                     }
                 }

tests/ui/range.stderr

@@ -1,4 +1,4 @@
-error: It is more idiomatic to use `v1.iter().enumerate()`
+error: it is more idiomatic to use `v1.iter().enumerate()`
   --> $DIR/range.rs:5:14
    |
 LL |     let _x = v1.iter().zip(0..v1.len());