mention new format args capture in docs

README.md

@@ -136,6 +136,13 @@ handlers for eyre and short summaries of what features they provide.
   return Err(eyre!("Missing attribute: {}", missing));
   ```
 
+- On newer versions of the compiler (e.g. 1.58 and later) this macro also
+  supports format args captures.
+
+  ```rust
+  return Err(eyre!("Missing attribute: {missing}"));
+  ```
+
 ## No-std support
 
 **NOTE**: tests are currently broken for `no_std` so I cannot guarantee that

src/lib.rs

@@ -193,6 +193,18 @@
 //!   #     Ok(())
 //!   # }
 //!   ```
+//! - On newer versions of the compiler (e.g. 1.58 and later) this macro also
+//!   supports format args captures.
+//!
+//!   ```rust
+//!   # use eyre::{eyre, Result};
+//!   #
+//!   # fn demo() -> Result<()> {
+//!   #     let missing = "...";
+//!   return Err(eyre!("Missing attribute: {missing}"));
+//!   #     Ok(())
+//!   # }
+//!   ```
 //!
 //! ## No-std support
 //!