message: Fix type: parser -> serializer
diff: @@ -63,7 +63,8 @@ public final class SerializationRegistry {
  KeySerializer<?, ?> existingSerializer = keySerializerMap.get(index);
  if (!existingSerializer.equals(serializer) || !serializer.equals(existingSerializer)) {
  throw new GeneralSecurityException(
  - "Attempt to register non-equal parser for already existing object of type: " + index);
  + "Attempt to register non-equal serializer for already existing object of type: "
  + + index);
  }
  } else {
  keySerializerMap.put(index, serializer);
  