Improve error msg for no matching rac.CodecReader

lib/rac/reader.go

diff --git a/lib/rac/reader.go b/lib/rac/reader.go
index 0a3739c..6060702 100644
--- a/lib/rac/reader.go
+++ b/lib/rac/reader.go
@@ -310,7 +310,16 @@
 		}
 	}
 	if codecReader == nil {
-		r.err = fmt.Errorf("rac: no matching CodecReader for Codec 0x%02X", chunk.Codec)
+		name := ""
+		switch chunk.Codec {
+		case CodecZlib:
+			name = " (Zlib)"
+		case CodecBrotli:
+			name = " (Brotli)"
+		case CodecZstandard:
+			name = " (Zstandard)"
+		}
+		r.err = fmt.Errorf("rac: no matching CodecReader for Codec 0x%02X%s", chunk.Codec, name)
 		return r.err
 	}