upgrade to laravel 7 and set branch to v2

vendor/symfony/console/Helper/HelperSet.php

@@ -37,12 +37,7 @@ class HelperSet implements \IteratorAggregate
         }
     }
 
-    /**
-     * Sets a helper.
-     *
-     * @param string $alias An alias
-     */
-    public function set(HelperInterface $helper, $alias = null)
+    public function set(HelperInterface $helper, string $alias = null)
     {
         $this->helpers[$helper->getName()] = $helper;
         if (null !== $alias) {
@@ -55,11 +50,9 @@ class HelperSet implements \IteratorAggregate
     /**
      * Returns true if the helper if defined.
      *
-     * @param string $name The helper name
-     *
      * @return bool true if the helper is defined, false otherwise
      */
-    public function has($name)
+    public function has(string $name)
     {
         return isset($this->helpers[$name]);
     }
@@ -67,13 +60,11 @@ class HelperSet implements \IteratorAggregate
     /**
      * Gets a helper value.
      *
-     * @param string $name The helper name
-     *
      * @return HelperInterface The helper instance
      *
      * @throws InvalidArgumentException if the helper is not defined
      */
-    public function get($name)
+    public function get(string $name)
     {
         if (!$this->has($name)) {
             throw new InvalidArgumentException(sprintf('The helper "%s" is not defined.', $name));