Hopefully improve some debugging

Author: keelerm84

eventsource-client/src/event_parser.rs

@@ -180,7 +180,10 @@ impl EventParser {
     }
 
     pub fn process_bytes(&mut self, bytes: Bytes) -> Result<()> {
-        trace!("Parsing bytes {:?}", bytes);
+        trace!(
+            "Parsing bytes {:?}",
+            from_utf8(&bytes).unwrap_or("<bad utf8>")
+        );
         // We get bytes from the underlying stream in chunks.  Decoding a chunk has two phases:
         // decode the chunk into lines, and decode the lines into events.
         //