title: FluentAssertions compile error after upgrade
body: <p>I have upgraded my project to the latest FluentAssertions and got a weird compilation error on the following line:</p>
  
  <pre><code>myArray.Should().Equal(new int[] { 0, 0, 1, 2, 3, 4, 5 });
  </code></pre>
  
  <p>The error is:</p>
  
  <blockquote>
    <p>'System.Array' does not contain a definition for 'Should' and no
    extension method 'Should' accepting a first argument of type
    'System.Array' could be found (are you missing a using directive or an
    assembly reference?)</p>
  </blockquote>