Update todo in example

[infinite-sea]

More of a request than issue.

Would be nice to show in the example how to "update" an item/todo. Adding and Deleting are fine for a simple list, but editing/updating and saving would be critical in a real world app.

[chrisvfritz]

I'd be happy to add this soon. 👍

[posva]

@chrisvfritz Go ahead 😄