Cannot style disabled pager buttons

**Affected Projects**
React

**Is your feature request related to a problem? Please describe.**
I'm trying to style my ReactiveSearch to look like the rest of my website. I'm having difficulty styling the disabled pager buttons. I'm using Bootstrap as the framework to style my website.
Pager buttons which are disabled do not take the disabled button style. The pager button markup looks like this:
```
Prev
```
Bootstrap does not like this because:
> ``s don’t support the disabled attribute

**Describe the solution you'd like**
Could you also add a disabled class?