Add return phpstan doc to getFeedback

Author: franmomu

src/Feedback.php

@@ -15,7 +15,10 @@ class Feedback
     /**
      * @param int $score
      * @param Match[] $sequence
-     * @return array
+     * @return array{
+     *      warning: string,
+     *      suggestions: string[]
+     * }
      */
     public function getFeedback($score, array $sequence)
     {

src/Matchers/Match.php

@@ -51,8 +51,10 @@ public function __construct($password, $begin, $end, $token)
      *
      * @param  bool $isSoleMatch
      *   Whether this is the only match in the password
-     * @return array
-     *   Associative array with warning (string) and suggestions (array of strings)
+     * @return array{
+     *      warning: string,
+     *      suggestions: string[]
+     * } Associative array with warning (string) and suggestions (array of strings)
      */
     abstract public function getFeedback($isSoleMatch);