Change API to take an object instead of 2nd paramter

Since the `packageName` is ignored if you pass in your own message, wouldn't it make sense to let the function take an object instead of a second parameter?

e.g.

```
sudoBlock('yo'); // Using default message
sudoBlock({ packageName: 'yo' }); // Same as above
sudoBlock({ msg: 'Thou shalt not use sudo!' });
```