Prepare master 1.6.0 release

https://github.com/FreshRSS/FreshRSS/issues/1328

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 2016-10-XX FreshRSS 1.6.0-dev
+## 2016-10-30 FreshRSS 1.6.0
 
 * CLI
 	* New Command-Line Interface (CLI) [#1095](https://github.com/FreshRSS/FreshRSS/issues/1095)

constants.php

@@ -1,5 +1,5 @@
 <?php
-define('FRESHRSS_VERSION', '1.6.0-dev');
+define('FRESHRSS_VERSION', '1.6.0');
 define('FRESHRSS_WEBSITE', 'http://freshrss.org');
 define('FRESHRSS_WIKI', 'http://doc.freshrss.org');