Update Parsedown library

vendor/symfony/finder/Finder.php

@@ -540,9 +540,9 @@ class Finder implements \IteratorAggregate, \Countable
 
         foreach ((array) $dirs as $dir) {
             if (is_dir($dir)) {
-                $resolvedDirs[] = $dir;
+                $resolvedDirs[] = $this->normalizeDir($dir);
             } elseif ($glob = glob($dir, (defined('GLOB_BRACE') ? GLOB_BRACE : 0) | GLOB_ONLYDIR)) {
-                $resolvedDirs = array_merge($resolvedDirs, $glob);
+                $resolvedDirs = array_merge($resolvedDirs, array_map(array($this, 'normalizeDir'), $glob));
             } else {
                 throw new \InvalidArgumentException(sprintf('The "%s" directory does not exist.', $dir));
             }
@@ -728,4 +728,16 @@ class Finder implements \IteratorAggregate, \Countable
 
         return $iterator;
     }
+
+    /**
+     * Normalizes given directory names by removing trailing slashes.
+     *
+     * @param string $dir
+     *
+     * @return string
+     */
+    private function normalizeDir($dir)
+    {
+        return rtrim($dir, '/'.\DIRECTORY_SEPARATOR);
+    }
 }