Derive `Default` using `serde::Deserialize`!
No mismatch between `Default` and `Deserialize` anymore!
`Cargo.toml`:
```toml
default-from-serde = "0.1"
```
See [docs.rs](https://docs.rs/default-from-serde) for the Rust code.
APACHE-2.0.
Some source code are copied from `serde_json`.
This library is practically deserialize using `serde_json` with `{}`.