Ignore incompatible_msrv clippy lint

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.65.0`
      --> src/fmt.rs:48:58
       |
    48 |             if let BacktraceStatus::Captured = backtrace.status() {
       |                                                          ^^^^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
       = note: `#[warn(clippy::incompatible_msrv)]` on by default

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.52.0`
       --> src/lib.rs:680:41
        |
    680 |         let fmt_arguments_as_str = args.as_str();
        |                                         ^^^^^^^^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

Author: dtolnay

src/lib.rs

@@ -221,6 +221,7 @@
     clippy::enum_glob_use,
     clippy::explicit_auto_deref,
     clippy::extra_unused_type_parameters,
+    clippy::incompatible_msrv,
     clippy::let_underscore_untyped,
     clippy::missing_errors_doc,
     clippy::missing_panics_doc,