Bump zipdownload plugin version number

plugins/zipdownload/composer.json

@@ -3,7 +3,7 @@
     "type": "roundcube-plugin",
     "description": "Adds an option to download all attachments to a message in one zip file, when a message has multiple attachments. Also allows the download of a selection of messages in one zip file. Supports mbox and maildir format.",
     "license": "GPLv3+",
-    "version": "3.0",
+    "version": "3.1",
     "authors": [
         {
             "name": "Thomas Bruederli",

plugins/zipdownload/zipdownload.js

@@ -46,7 +46,7 @@ window.rcmail && rcmail.addEventListener('init', function(evt) {
         span.text(rcmail.get_label('zipdownload.download'));
         rcmail.env.download_link = link;
     });
-  });
+});
 
 
 function rcmail_zipdownload(mode)

plugins/zipdownload/zipdownload.php

@@ -6,7 +6,7 @@
  * Plugin to allow the download of all message attachments in one zip file
  * and downloading of many messages in one go.
  *
- * @version 3.0
+ * @version 3.1
  * @requires php_zip extension (including ZipArchive class)
  * @author Philip Weir
  * @author Thomas Bruderli
@@ -119,7 +119,7 @@ class zipdownload extends rcube_plugin
      */
     public function download_attachments()
     {
-        $rcmail    = rcmail::get_instance();
+        $rcmail = rcmail::get_instance();
 
         // require CSRF protected request
         $rcmail->request_security_check(rcube_utils::INPUT_GET);