add licence info

CHANGELOG.md

@@ -8,6 +8,10 @@ All notable changes to this project will be documented in this file. The format
 - find config.php automatically in current and parent directories. Show error message if not found. 
 - use local CSS/JS instead of CDN
 - detect missing imap extension and config error
+- refactoring to simplify routing
+
+### Removed
+- JSON API (json-api.php), this feature would better fit in a separate project. 
 
 ## [0.2.1] - 2018-07-01
 

src/autolink.php

@@ -1,7 +1,15 @@
 <?php
 
-class AutoLinkExtension {
-    static public function auto_link_text(string $string) {
+/**
+ * Adapted from https://plugins.trac.wordpress.org/browser/sem-external-links/trunk/sem-autolink-uri.php
+ * which is MIT/GPL licenced.
+ *    Author: Denis de Bernardy & Mike Koepke
+ *    Author URI: https://www.semiologic.com
+ */
+class AutoLinkExtension
+{
+    static public function auto_link_text(string $string)
+    {
 
         $string = preg_replace_callback("/
             ((?<![\"'])                                     # don't look inside quotes