Update version and changelog

Author: rajumsys

readme.txt

@@ -3,7 +3,7 @@ Contributors: sparkpost, rajuru
 Tags: sparkpost, smtp, wp_mail, mail, email
 Requires at least: 4.0
 Tested up to: 4.4.2
-Stable tag: 2.3.0
+Stable tag: 2.4.0
 License: GPLv2 or later
 
 Send all your email from WordPress through SparkPost, the most advanced email delivery service.
@@ -47,6 +47,9 @@ Visit our [support site](https://support.sparkpost.com/) for help.
 
 == Changelog ==
 
+= 2.4.0 =
+- Add supports for CC and BCC using HTTP API
+
 = 2.3.0 =
 
 - Fixed issue [#33](https://github.com/SparkPost/wordpress-sparkpost/issues/33) where from email and reply to were being overridden by templates: see [this article](https://support.sparkpost.com/customer/portal/articles/2409547-using-templates-with-the-sparkpost-wordpress-plugin) for detailed information

wordpress-sparkpost.php

@@ -6,7 +6,7 @@
 Plugin Name: SparkPost
 Plugin URI: http://sparkpost.com/
 Description: Send all your email from Wordpress through SparkPost, the world's most advanced email delivery service.
-Version: 2.3.0
+Version: 2.4.0
 Author: SparkPost
 Author URI: http://sparkpost.com
 License: GPLv2 or later