Ignore trivially_copy_pass_by_ref pedantic clippy lint in test

warning: this argument (4 byte) is passed by reference, but would be more efficient if passed by value (limit: 8 byte)
       --> tests/test_display.rs:388:16
        |
    388 |     fn pair(k: &i32, v: &i32, formatter: &mut fmt::Formatter) -> fmt::Result {
        |                ^^^^ help: consider passing by value instead: `i32`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
        = note: `-W clippy::trivially-copy-pass-by-ref` implied by `-W clippy::pedantic`
        = help: to override `-W clippy::pedantic` add `#[allow(clippy::trivially_copy_pass_by_ref)]`

    warning: this argument (4 byte) is passed by reference, but would be more efficient if passed by value (limit: 8 byte)
       --> tests/test_display.rs:388:25
        |
    388 |     fn pair(k: &i32, v: &i32, formatter: &mut fmt::Formatter) -> fmt::Result {
        |                         ^^^^ help: consider passing by value instead: `i32`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref

tests/test_display.rs

@@ -1,6 +1,7 @@
 #![allow(
     clippy::needless_lifetimes,
     clippy::needless_raw_string_hashes,
+    clippy::trivially_copy_pass_by_ref,
     clippy::uninlined_format_args
 )]