Ignore let_underscore_untyped pedantic clippy lint

    error: non-binding `let` without a type annotation
      --> src/libyaml/util.rs:46:9
       |
    46 |         let _ = unsafe { Box::from_raw(self.ptr.as_ptr()) };
       |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       |
       = help: consider adding a type annotation or removing the `let` keyword
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_underscore_untyped
       = note: `-D clippy::let-underscore-untyped` implied by `-D clippy::pedantic`

src/lib.rs

@@ -147,6 +147,7 @@
     clippy::derived_hash_with_manual_eq,
     clippy::doc_markdown,
     clippy::items_after_statements,
+    clippy::let_underscore_untyped,
     clippy::manual_map,
     clippy::missing_panics_doc,
     clippy::never_loop,