用 JOOL 处理 checked exception
https://github.com/jOOQ/jOOL

before:

```
Arrays.stream(dir.listFiles()).forEach(file -> {
try {
System.out.println(file.getCanonicalPath());
}
catch (IOException e) {
throw new RuntimeException(e);
}

// Ouch, my fingers hurt! All this typing!
});
```

after:

```
Arrays.stream(dir.listFiles()).forEach(
Unchecked.consumer(file -> { System.out.println(file.getCanonicalPath()); })
);
```