Minification issue
Latest version (2.0.5) has a minification error, what can be seen in the [sizing page](https://boxicons.com/usage/#sizing); when you try to put ur icon with the class `bx-lg`, it doesn't show correctly 'cause in minified file has next error.

```css
font-size:3.0!important ...
```

Meanwhile, in the `boxicon.css` file, has the next instruction. The `rem` unit has ignored by the minifier.

https://github.com/atisawd/boxicons/blob/68c7b94e427cf554c204c72d11a0c4dbb136e601/css/boxicons.css#L465

If you inspect the element with the navigator inspector, you can see the incorrect value alert.