ronf 0.4.0

Configuration system with saving
Documentation 
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# Ronf

A configuration library with saving based on [config-rs](https://github.com/rust-cli/config-rs/tree/main).

## Examples

```rust
use ronf::prelude::{Config, File, FileFormat};

fn main() {
    let config = Config::builder()
        .add(File::new_str(
            "test_file",
            FileFormat::Json,
            "{\"key\": \"value\"}",
        ))
        .build()
        .unwrap();
    println!("\"key\": {}", config.get("key").unwrap());
}
```

For more examples, check `examples/`. Run with `cargo run --example FILE_NAME`.

## Features

- `ordered` - Uses HashMap from `indexmap` instead of `std::collections` to preserve order of arrays;
- `load_after_build` - Enables loading saves on `Config` (After building with `ConfigBuilder::build()`);
- `read_file` - Add functions to read `File` from path;
- `env` - Adds `.env()` on `ConfigBuilder` to overwrite keys with env vars.

### File formats

- `ini` - Load [Ini files](https://en.wikipedia.org/wiki/INI_file).
- `json` - Load [Json files](https://en.wikipedia.org/wiki/JSON).
- `yaml` - Load [Yaml files](https://en.wikipedia.org/wiki/YAML).
- `toml` - Load [Toml files](https://en.wikipedia.org/wiki/TOML).
- `ron` - Load [Ron files](https://github.com/ron-rs/ron).