Update composer dependencies

vendor/ezyang/htmlpurifier/maintenance/generate-ph5p-patch.php

@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * @file
+ * This file compares our version of PH5P with Jero's original version, and
+ * generates a patch of the differences. This script should be run whenever
+ * library/HTMLPurifier/Lexer/PH5P.php is modified.
+ */
+
+$orig = realpath(dirname(__FILE__) . '/PH5P.php');
+$new  = realpath(dirname(__FILE__) . '/../library/HTMLPurifier/Lexer/PH5P.php');
+$newt = dirname(__FILE__) . '/PH5P.new.php'; // temporary file
+
+// minor text-processing of new file to get into same format as original
+$new_src = file_get_contents($new);
+$new_src = '<?php' . PHP_EOL . substr($new_src, strpos($new_src, 'class HTML5 {'));
+
+file_put_contents($newt, $new_src);
+shell_exec("diff -u \"$orig\" \"$newt\" > PH5P.patch");
+unlink($newt);
+
+// vim: et sw=4 sts=4