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diff --git a/vendor/symfony/console/Symfony/Component/Console/Helper/DialogHelper.php b/vendor/symfony/console/Symfony/Component/Console/Helper/DialogHelper.php
new file mode 100644
index 0000000..03daf8c
--- /dev/null
+++ b/vendor/symfony/console/Symfony/Component/Console/Helper/DialogHelper.php
@@ -0,0 +1,141 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Console\Helper;
+
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * The Dialog class provides helpers to interact with the user.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class DialogHelper extends Helper
+{
+    private $inputStream;
+
+    /**
+     * Asks a question to the user.
+     *
+     * @param OutputInterface $output   An Output instance
+     * @param string|array    $question The question to ask
+     * @param string          $default  The default answer if none is given by the user
+     *
+     * @return string The user answer
+     *
+     * @throws \RuntimeException If there is no data to read in the input stream
+     */
+    public function ask(OutputInterface $output, $question, $default = null)
+    {
+        $output->write($question);
+
+        $ret = fgets($this->inputStream ?: STDIN, 4096);
+        if (false === $ret) {
+            throw new \RuntimeException('Aborted');
+        }
+        $ret = trim($ret);
+
+        return strlen($ret) > 0 ? $ret : $default;
+    }
+
+    /**
+     * Asks a confirmation to the user.
+     *
+     * The question will be asked until the user answers by nothing, yes, or no.
+     *
+     * @param OutputInterface $output   An Output instance
+     * @param string|array    $question The question to ask
+     * @param Boolean         $default  The default answer if the user enters nothing
+     *
+     * @return Boolean true if the user has confirmed, false otherwise
+     */
+    public function askConfirmation(OutputInterface $output, $question, $default = true)
+    {
+        $answer = 'z';
+        while ($answer && !in_array(strtolower($answer[0]), array('y', 'n'))) {
+            $answer = $this->ask($output, $question);
+        }
+
+        if (false === $default) {
+            return $answer && 'y' == strtolower($answer[0]);
+        }
+
+        return !$answer || 'y' == strtolower($answer[0]);
+    }
+
+    /**
+     * Asks for a value and validates the response.
+     *
+     * The validator receives the data to validate. It must return the
+     * validated data when the data is valid and throw an exception
+     * otherwise.
+     *
+     * @param OutputInterface $output    An Output instance
+     * @param string|array    $question  The question to ask
+     * @param callback        $validator A PHP callback
+     * @param integer         $attempts  Max number of times to ask before giving up (false by default, which means infinite)
+     * @param string          $default   The default answer if none is given by the user
+     *
+     * @return mixed
+     *
+     * @throws \Exception When any of the validators return an error
+     */
+    public function askAndValidate(OutputInterface $output, $question, $validator, $attempts = false, $default = null)
+    {
+        $error = null;
+        while (false === $attempts || $attempts--) {
+            if (null !== $error) {
+                $output->writeln($this->getHelperSet()->get('formatter')->formatBlock($error->getMessage(), 'error'));
+            }
+
+            $value = $this->ask($output, $question, $default);
+
+            try {
+                return call_user_func($validator, $value);
+            } catch (\Exception $error) {
+            }
+        }
+
+        throw $error;
+    }
+
+    /**
+     * Sets the input stream to read from when interacting with the user.
+     *
+     * This is mainly useful for testing purpose.
+     *
+     * @param resource $stream The input stream
+     */
+    public function setInputStream($stream)
+    {
+        $this->inputStream = $stream;
+    }
+
+    /**
+     * Returns the helper's input stream
+     *
+     * @return string
+     */
+    public function getInputStream()
+    {
+        return $this->inputStream;
+    }
+
+    /**
+     * Returns the helper's canonical name.
+     *
+     * @return string The helper name
+     */
+    public function getName()
+    {
+        return 'dialog';
+    }
+}