Kalendar verze 1.5.2

git-svn-id: https://plugins.svn.wordpress.org/kalendar-cz/trunk@943761 b8457f37-d9ea-0310-8a92-e5e31aec5664
uprava readme na 1.5.2

git-svn-id: https://plugins.svn.wordpress.org/kalendar-cz/trunk@943762 b8457f37-d9ea-0310-8a92-e5e31aec5664