title: can't install cviebrock/eloquent-sluggable
body: <p>I try install  cviebrock/eloquent-sluggable</p>
  <pre><code>composer require cviebrock/eloquent-sluggable
  </code></pre>
  <p>and got error</p>
  <pre><code>  Problem 1
      - cviebrock/eloquent-sluggable[8.0.0, ..., 8.0.2] require illuminate/config ^8.0 -&gt; found illuminate/config[v8.0.0, ..., 8.x-dev] but these were not loaded, likely because it conflicts with anoth
  er require.
      - Root composer.json requires cviebrock/eloquent-sluggable ^8.0 -&gt; satisfiable by cviebrock/eloquent-sluggable[8.0.0, 8.0.1, 8.0.2].
  </code></pre>
  <p>How fix it?</p>