Simple library to watch file changes inside given directory.
Usage example:
```rust
use fs_change_notifier::{create_watcher, match_event, RecursiveMode};
let root = PathBuf::from(".");
let (mut wr, rx) = create_watcher(|e| log::error!("{e:?}")).unwrap();
wr.watch(&root, RecursiveMode::Recursive).unwrap();
loop {
}
```