Fix some compatibility issue

git-svn-id: https://plugins.svn.wordpress.org/html-social-share-buttons/trunk@856446 b8457f37-d9ea-0310-8a92-e5e31aec5664
set version

git-svn-id: https://plugins.svn.wordpress.org/html-social-share-buttons/trunk@856449 b8457f37-d9ea-0310-8a92-e5e31aec5664