Upgrade framework

vendor/symfony/console/Helper/HelperInterface.php

@@ -20,22 +20,18 @@ interface HelperInterface
 {
     /**
      * Sets the helper set associated with this helper.
-     *
-     * @param HelperSet $helperSet A HelperSet instance
      */
     public function setHelperSet(HelperSet $helperSet = null);
 
     /**
      * Gets the helper set associated with this helper.
-     *
-     * @return HelperSet A HelperSet instance
      */
-    public function getHelperSet();
+    public function getHelperSet(): ?HelperSet;
 
     /**
      * Returns the canonical name of this helper.
      *
-     * @return string The canonical name
+     * @return string
      */
     public function getName();
 }