delete plugin ver 1.3

git-svn-id: https://plugins.svn.wordpress.org/bookingcom-official-searchbox/trunk@1006570 b8457f37-d9ea-0310-8a92-e5e31aec5664
release plugin ver 1.3.1

git-svn-id: https://plugins.svn.wordpress.org/bookingcom-official-searchbox/trunk@1006571 b8457f37-d9ea-0310-8a92-e5e31aec5664