Security Updates

Hardened it a bit. Added a Roundcube update checker.

Author: texxasrulez

README.md

@@ -1,5 +1,6 @@
 # Plugin Manager for Roundcube
 
+![GitHub Downloads (all assets, all releases)](https://img.shields.io/github/downloads/texxasrulez/plugin_manager/total?style=plastic&logo=github&logoColor=white&label=Downloads&labelColor=blue&color=aqua)
 [![Packagist Downloads](https://img.shields.io/packagist/dt/texxasrulez/plugin_manager?style=plastic&logo=packagist&logoColor=white&label=Downloads&labelColor=blue&color=gold)](https://packagist.org/packages/texxasrulez/plugin_manager)
 [![Packagist Version](https://img.shields.io/packagist/v/texxasrulez/plugin_manager?style=plastic&logo=packagist&logoColor=white&label=Version&labelColor=blue&color=limegreen)](https://packagist.org/packages/texxasrulez/plugin_manager)
 [![Github License](https://img.shields.io/github/license/texxasrulez/plugin_manager?style=plastic&logo=github&label=License&labelColor=blue&color=coral)](https://github.com/texxasrulez/plugin_manager/LICENSE)

config.inc.php.dist

@@ -4,6 +4,7 @@
 // ===== Core behavior =====
 $config['pm_debug'] = false;
 $config['pm_remote_checks'] = true;           // query GitHub for remote versions
+$config['pm_roundcube_release_channel'] = 'stable'; // 'stable' (final releases only) or 'rc' (include pre-releases)
 $config['pm_request_timeout'] = 7;            // HTTP timeout (seconds)
 $config['pm_cache_ttl'] = 43200;              // remote check cache TTL (seconds)
 $config['pm_plugin_root'] = null;             // override plugins root dir (null = auto)