* improve: user input sanitization

git-svn-id: https://plugins.svn.wordpress.org/simple-course-creator-post-meta/trunk@940201 b8457f37-d9ea-0310-8a92-e5e31aec5664
update version

git-svn-id: https://plugins.svn.wordpress.org/simple-course-creator-post-meta/trunk@940202 b8457f37-d9ea-0310-8a92-e5e31aec5664