Search not working

When searching with the docs built with this theme (v 0.2.2), the search page idles and the JS console says:

```
Uncaught ReferenceError: Stemmer is not defined
```

According to this [issue](https://github.com/sphinx-doc/sphinx/issues/8623) it was fixed by the `sphinx_rtd_repo`. I imagine a simple update to `0.5.1` of the dependency should do the trick.