macroconf 0.2.0

macro for creating configurations using miniconf
Documentation 
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# macroconf

This library provides a macro to create configs with metadata attached to the values.
The [miniconf](https://github.com/quartiq/miniconf) library is used to make the metadata and the values accessible.

## Example

```rust
use miniconf::Tree;
use macroconf::config;

#[config]
#[derive(Tree)]
struct Config {
    ordinary: i32,

    #[min = 10]
    #[max = 20]
    clamped: u8

    #[default = 42]
    has_default: i32;

    /// Doc comments are used as description
    with_description: i32
}

/* The resulting miniconf tree looks like this:
 * /
 * |-ordinary
 * |
 * |-clamped
 * | |-value
 * | |-min
 * | |-max
 * |
 * |-has_default
 * | |-value
 * | |-default
 * |
 * |-with_description
 *   |-value
 *   |-description
 */
```