Rust library for [nina.api.bund.dev], the german warn system.
```rust
use nina::*;
let ags = "091620000000";
let covidrules_for_ags = covidrules(ags).unwrap();
let overview_for_ags = overview(ags).unwrap();
let mut warnings: Vec<MapWarning> = Vec::new();
warnings.extend(mowas().unwrap());
warnings.extend(katwarn().unwrap());
warnings.extend(biwapp().unwrap());
```