Update to v1.2

git-svn-id: https://plugins.svn.wordpress.org/guitar-chord-widget-for-wordpress/trunk@806183 b8457f37-d9ea-0310-8a92-e5e31aec5664
update v1.2 readme file

git-svn-id: https://plugins.svn.wordpress.org/guitar-chord-widget-for-wordpress/trunk@806186 b8457f37-d9ea-0310-8a92-e5e31aec5664