message: Avoid deprecated API in the root README.
diff: @@ -163,7 +163,7 @@ Renderer* renderer = engine->createRenderer();
  To render a frame you must then create a `View`, a `Scene` and a `Camera`:
  ```c++
  -Camera* camera = engine->createCamera();
  +Camera* camera = engine->createCamera(EntityManager::get().create());
  View* view = engine->createView();
  Scene* scene = engine->createScene();
  