Improved Readme.txt file

git-svn-id: https://plugins.svn.wordpress.org/hs-social-media-buttons/trunk@819726 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improved Readme.txt file

git-svn-id: https://plugins.svn.wordpress.org/hs-social-media-buttons/trunk@819728 b8457f37-d9ea-0310-8a92-e5e31aec5664