Not compatible with Acorn ^3.0

[matapatos]

In Providers/NaviServiceProvider.php the use should be changed from:

use Roots\Acorn\ServiceProvider;

To:

use Roots\Acorn\Sage\SageServiceProvider;

[Log1x]

Roots\Acorn\ServiceProvider will probably get removed in a later version of Acorn but it still works as-is.

We wouldn't extend SageServiceProvider, but instead Illuminate\Support\ServiceProvider directly.