Release version 3.3.0

This version focus on speed improvement when sending emails:

* Drastic speed increase when sending emails with RealUrl (or similar)
* Support for TYPO3 8
* Prevent sending Newsletter containing errors
* Show bounce account count in scheduler
* Bubble up fetchmail error to Scheduler GUI
* Remove version from default User-Agent for security reason

ext_emconf.php

@@ -4,7 +4,7 @@
     'title' => 'Newsletter',
     'description' => 'Send any pages as Newsletter and provide statistics on opened emails and clicked links.',
     'category' => 'module',
-    'version' => '3.2.0',
+    'version' => '3.3.0',
     'state' => 'stable',
     'uploadfolder' => 1,
     'author' => 'Ecodev',