Ch8 Items - ConvertSaveload in WantsToDropItem component

Hello,
I'm a beginner following along with the tutorial and I came across a derivation that seems to be incorrect:

```
#[derive(Component, Debug, ConvertSaveload, Clone)]
pub struct WantsToDropItem {
pub item : Entity
}
```
From another closed issue it seems like the **ConvertSaveload** is an error? Either that or I'm missing something important. No matter how I change things in the includes I get errors about being unable to find 'serde' in the list of imported crates.