fix typo in axum-macros README: according to Cargo.toml msrv is 1.60 (#2204)

axum-macros/Cargo.toml

@@ -2,7 +2,7 @@
 categories = ["asynchronous", "network-programming", "web-programming"]
 description = "Macros for axum"
 edition = "2021"
-rust-version = "1.60"
+rust-version = "1.63"
 homepage = "https://github.com/tokio-rs/axum"
 keywords = ["axum"]
 license = "MIT"

axum-macros/src/axum_test.rs

@@ -27,7 +27,7 @@ fn replace_nest_with_nest_service(mut item_fn: ItemFn) -> Option<ItemFn> {
     let mut visitor = NestToNestService::default();
     syn::visit_mut::visit_item_fn_mut(&mut visitor, &mut item_fn);
 
-    (visitor.count > 0).then(|| item_fn)
+    (visitor.count > 0).then_some(item_fn)
 }
 
 #[derive(Default)]