title: Associative array align => with PHP-CS-Fixer
body: <p>Should associative array => should be align with PHP-CS-Fixer ?</p>
  
  <pre><code>$array = [
      1    =&gt; 'a',
      '1'  =&gt; 'b',
      1.5  =&gt; 'c',
      true =&gt; 'd',
  ];
  </code></pre>
  
  <p>or </p>
  
  <pre><code>$array = [
      1 =&gt; 'a',
      '1' =&gt; 'b',
      1.5 =&gt; 'c',
      true =&gt; 'd',
  ];
  </code></pre>
  
  <p>I didn't find filter for that in <a href="https://github.com/FriendsOfPHP/PHP-CS-Fixer" rel="noreferrer">https://github.com/FriendsOfPHP/PHP-CS-Fixer</a></p>