add tag to readme

git-svn-id: https://plugins.svn.wordpress.org/tidio-elements-integrator/trunk@904159 b8457f37-d9ea-0310-8a92-e5e31aec5664
add tag to readme

git-svn-id: https://plugins.svn.wordpress.org/tidio-elements-integrator/trunk@904160 b8457f37-d9ea-0310-8a92-e5e31aec5664