Update lib.rs: Response vs Request in trace! log (#809)

* Update lib.rs: Response vs Request in trace! log

* Update lambda-runtime/src/lib.rs

Co-authored-by: David Calavera <david.calavera@gmail.com>

---------

Co-authored-by: David Calavera <david.calavera@gmail.com>

Author: lmammino

lambda-runtime/src/lib.rs

@@ -126,7 +126,7 @@ impl Runtime {
             // Group the handling in one future and instrument it with the span
             async {
                 let body = body.collect().await?.to_bytes();
-                trace!("response body - {}", std::str::from_utf8(&body)?);
+                trace!(body = std::str::from_utf8(&body)?, "raw JSON event received from Lambda");
 
                 #[cfg(debug_assertions)]
                 if parts.status.is_server_error() {