shallow 0.2.0

shallow long text
Documentation 
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# Text Shallow


- character by character, place-holder mode

```rust
# use shallow::CharacterShallow;


#[test]

fn fill_placeholder() {
    const TEXT10: &str = "1234567890";
    const TEXT21: &str = "1234567890_1234567890";
    const TEXT27: &str = "1234567890_1234567890_12345";
    let sb = CharacterShallow::new(21, 5);
    assert_eq!(sb.build_cow(TEXT10), TEXT10);
    assert_eq!(sb.build_cow(TEXT21), "1234567890_1234567890"); // nothing changed
    assert_eq!(sb.build_cow(TEXT27), "123456789 <...> 12345");
    let sb = sb.with_shallow_text("..."); // replace shallow text
    assert_eq!(sb.build_cow(TEXT27), "1234567890_12...12345");
    let sb = sb.with_end_reserved(0); // cancel end reserved
    assert_eq!(sb.build_cow(TEXT27), "1234567890_1234567...");
}
```