V9: Cannot find module 'sanitize.css/page.css'

Related: #60

Can we also have a 9.0.1 patch please ?

I'm stuck with PostCSS 7 in my project and it looks like postcss-normalize 9.0.0 now breaks every project build with this error:
```
Syntax Error: Error: Loading PostCSS Plugin failed: Cannot find module 'sanitize.css/page.css'
````

Thanks

Start by reviewing issue #60 and reproducing the reported failure with postcss-normalize 9.0.0 in a project that uses PostCSS 7. Inspect how the package references sanitize.css/page.css; done means the missing-module error is resolved for that setup and the requested 9.0.1 patch release is available.

Written by the indexing model from the issue text.