change version to 4.3

git-svn-id: http://plugins.svn.wordpress.org/all-in-one-favicon/trunk@671473 b8457f37-d9ea-0310-8a92-e5e31aec5664
release version 4.3

git-svn-id: http://plugins.svn.wordpress.org/all-in-one-favicon/trunk@671474 b8457f37-d9ea-0310-8a92-e5e31aec5664