Bump version to 5.7.0 and update changelog

Update tested up to WordPress 7.0, remove classicpress tag,
and add changelog entries for SSRF fix, WP handler fix, double
slash fix, avatar setting fix, and comment query fix.

Author: pfefferle

readme.md

@@ -2,10 +2,10 @@
 
 - Contributors: pfefferle, dshanske, indieweb
 - Donate link: https://notiz.blog/donate/
-- Tags: webmention, pingback, trackback, linkback, indieweb, classicpress
+- Tags: webmention, pingback, trackback, linkback, indieweb
 - Requires at least: 6.2
-- Tested up to: 6.9
-- Stable tag: 5.6.3
+- Tested up to: 7.0
+- Stable tag: 5.7.0
 - Requires PHP: 7.2
 - License: MIT
 - License URI: https://opensource.org/licenses/MIT
@@ -101,8 +101,11 @@ While not all display options can be settings, we are looking to provide some si
 
 Project and support maintained on github at [pfefferle/wordpress-webmention](https://github.com/pfefferle/wordpress-webmention).
 
-### 5.6.3
+### 5.7.0
 
+* Fix blind SSRF vulnerability by using `wp_safe_remote_get` for author page and tools requests
+* Fix undefined constant error in WP handler
+* Fix double slash in avatar upload directory path
 * Fix "Show avatars on Webmentions" setting having no effect
 * Fix comment query to respect explicit `type` parameter
 

webmention.php

@@ -5,7 +5,7 @@
  * Description: Webmention support for WordPress posts
  * Author: Matthias Pfefferle
  * Author URI: https://notiz.blog/
- * Version: 5.6.3
+ * Version: 5.7.0
  * License: MIT
  * License URI: https://opensource.org/licenses/MIT
  * Text Domain: webmention
@@ -14,7 +14,7 @@
 
 namespace Webmention;
 
-\define( 'WEBMENTION_VERSION', '5.6.3' );
+\define( 'WEBMENTION_VERSION', '5.7.0' );
 
 \define( 'WEBMENTION_PLUGIN_DIR', \plugin_dir_path( __FILE__ ) );
 \define( 'WEBMENTION_PLUGIN_BASENAME', \plugin_basename( __FILE__ ) );