compatibility readme

git-svn-id: https://plugins.svn.wordpress.org/3b-meteo/trunk@978516 b8457f37-d9ea-0310-8a92-e5e31aec5664
compatibility readme

git-svn-id: https://plugins.svn.wordpress.org/3b-meteo/trunk@978539 b8457f37-d9ea-0310-8a92-e5e31aec5664