data-url 0.2.0

# data-url

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Processing of `data:` URLs in Rust according to the Fetch Standard:
<https://fetch.spec.whatwg.org/#data-urls>
but starting from a string rather than a parsed URL to avoid extra copies.

```rust
use data_url::{DataUrl, mime};

let url = DataUrl::process("data:,Hello%20World!").unwrap();
let (body, fragment) = url.decode_to_vec().unwrap();

assert_eq!(url.mime_type().type_, "text");
assert_eq!(url.mime_type().subtype, "plain");
assert_eq!(url.mime_type().get_parameter("charset"), Some("US-ASCII"));
assert_eq!(body, b"Hello World!");
assert!(fragment.is_none());
```