MDL-48883 mod_lesson: Updating mod_lesson version

Updating it to today's date instead of using
stable branches version convention.

mod/lesson/version.php

@@ -24,7 +24,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2015012301;       // The current module version (Date: YYYYMMDDXX)
+$plugin->version   = 2015021800;       // The current module version (Date: YYYYMMDDXX)
 $plugin->requires  = 2014110400;    // Requires this Moodle version
 $plugin->component = 'mod_lesson'; // Full name of the plugin (used for diagnostics)
 $plugin->cron      = 0;