Fix the sample output in the README example

The code was fixed in #868, but the
sample output is still incorrect.

Author: crodjer

README.md

@@ -98,7 +98,7 @@ Hello, Chashu! I've put in an order for 4 shoes
 $ curl localhost:8080/orders/shoes -d '{ "name": "Mary Millipede", "legs": 750 }'
 ```
 ```text
-number too large to fit in target type
+Hello, Mary Millipede! I've put in an order for 750 shoes
 ```
 
 See more examples in the [examples](https://github.com/http-rs/tide/tree/main/examples) directory.

src/lib.rs

@@ -49,7 +49,7 @@
 //! Hello, Chashu! I've put in an order for 4 shoes
 //!
 //! $ curl localhost:8080/orders/shoes -d '{ "name": "Mary Millipede", "legs": 750 }'
-//! number too large to fit in target type
+//! Hello, Mary Millipede! I've put in an order for 750 shoes
 //! ```
 //! See more examples in the [examples](https://github.com/http-rs/tide/tree/main/examples) directory.