Blacklisted pseudo class not excluded correctly

Hi,

I encountered a problem while using Angular:

The `:host` pseudo class is in the blacklist configuration.

The following element is given:
```html

```
where `` is the host tag and could be styled with `:host {...}`

Imagine the following scss as used in Angular

```scss
:host {
&.variant {
.block .element:active { color: blue}
}
}
```

The same as css:

```css
:host.hostVariant .block .element:active {
color: blue;
}
```

The result is:

```css
:host.hostVariant .block .element:active,
.\:host.hostVariant .block .element.\:active {
color: blue;
}
```

The expected result:
```css
:host.hostVariant .block .element:active,
:host.hostVariant .block .element.\:active {
color: blue;
}
```

The styling is broken when using a class (`.`) on the host (`:host`) element.
The same problem will occur when using IDs (`#`) on the host (`:host`) element.

I will submit my PR in a few minutes.

I would really appreciate to get the next release published on npm, too.

All the best,
Philipp