URI.Munge munges https to http URIs.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

library/HTMLPurifier/URIScheme.php

@@ -19,6 +19,12 @@ abstract class HTMLPurifier_URIScheme
      */
     public $browsable = false;
 
+    /**
+     * Whether or not data transmitted over this scheme is encrypted.
+     * https is secure, http is not.
+     */
+    public $secure = false;
+
     /**
      * Whether or not the URI always uses <hier_part>, resolves edge cases
      * with making relative URIs absolute