- Update 2.6.3 version

git-svn-id: https://plugins.svn.wordpress.org/wp-sms/trunk@1045111 b8457f37-d9ea-0310-8a92-e5e31aec5664
- update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/wp-sms/trunk@1045113 b8457f37-d9ea-0310-8a92-e5e31aec5664