Update vendored libs

vendor/gregwar/captcha/demo/session.php

@@ -0,0 +1,22 @@
+<?php
+// We need the session to store the correct phrase for later check
+session_start();
+
+// Including the autoload (you need to composer install in the main directory)
+require_once __DIR__.'/../vendor/autoload.php';
+
+use Gregwar\Captcha\CaptchaBuilder;
+
+// Creating the captcha instance and setting the phrase in the session to store
+// it for check when the form is submitted
+$captcha = new CaptchaBuilder;
+$_SESSION['phrase'] = $captcha->getPhrase();
+
+// Setting the header to image jpeg because we here render an image
+header('Content-Type: image/jpeg');
+
+// Running the actual rendering of the captcha image
+$captcha
+    ->build()
+    ->output()
+;