to trunk 1.2.0

git-svn-id: https://plugins.svn.wordpress.org/widget-visibility/trunk@1048132 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated stable tag 1.2.0

git-svn-id: https://plugins.svn.wordpress.org/widget-visibility/trunk@1048135 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated README.txt

git-svn-id: https://plugins.svn.wordpress.org/widget-visibility/trunk@1048137 b8457f37-d9ea-0310-8a92-e5e31aec5664