Updating compatibility version.

git-svn-id: https://plugins.svn.wordpress.org/wolfnet-idx-for-wordpress/trunk@920086 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixing stable tag version.

git-svn-id: https://plugins.svn.wordpress.org/wolfnet-idx-for-wordpress/trunk@920088 b8457f37-d9ea-0310-8a92-e5e31aec5664