updated stable tag to 2.0.3

git-svn-id: https://plugins.svn.wordpress.org/ar-simple-social-share/trunk@991309 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated version number

git-svn-id: https://plugins.svn.wordpress.org/ar-simple-social-share/trunk@991313 b8457f37-d9ea-0310-8a92-e5e31aec5664