instantiate binding, when used

bootstrap/container.php

@@ -3,9 +3,10 @@
 use DI\Container;
 use FreightQuote\User\FlatFileUserRepository;
 use FreightQuote\User\UserRepository;
+use DI;
 
 $container = new Container([
-    UserRepository::class => FlatFileUserRepository::class,
+    UserRepository::class => DI\create(FlatFileUserRepository::class),
 ]);
 
 return $container;