::devMode and ::prodMode with optional parameter?

[josefsabl]

Maybe the GraphQLite\SchemaFactory::devMode and GraphQLite\SchemaFactory::prodMode could accept an optional parameter like this:

function devMode(bool $v = true);
function prodMode(bool $v = true);

This way, instead of:

$schemaFactory
  ->addNamespace
  ->setFinder(...);

if (DEV_MODE) {
  $schemaFactory->devMode();
} else {
  $schemaFactory->prodMode();
}

One could simply write:

$schemaFactory
  ->addNamespace
  ->setFinder(...);
  ->devMode(DEV_MODE);