multidict 0.3.0

Python MultiDict implementation.
Documentation 
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# multidict

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The `multidict` crate was inspired by Python `MultiDict` [library](https://multidict.aio-libs.org/en/stable/).

`multidict` is useful for working with HTTP headers, URL query, form-data args etc.
HTTP Headers and URL query string require specific data structure: `multidict`.
It behaves mostly like a regular map but it may have several values for the same key and preserves insertion ordering

## How to install?

We recommend using the latest version of Rust. `multidict` supports Rust 2021.

Install by Cargo command:
```bash
cargo add multidict
```

Add line in your `Cargo.toml` file:
```toml
multidict = "0.0.1"
```

## How to test?

Run full tests (with docstrings):
```bash
cargo test
```
Or only project specified tests:
 ```bash
 cargo test --tests
 ```