serde_trim 0.2.0

serde deserialize_with String trim
Documentation 
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[serde_trim][docsrs]:: serde deserialize_with string trim
========================================
[docsrs]: https://docs.rs/serde_trim

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## how to use
```rust
fn main() {
    #[derive(Debug, Deserialize)]
    struct Foo {
        #[serde(deserialize_with = "string_trim")]
        name: String,
    }
    let json = r#"{"name":" "}"#;
    let foo = serde_json::from_str::<Foo>(json).unwrap();
    assert_eq!(foo.name, "");
}
```