[Added] 2 news icons added - "Mail To" and "Website".

git-svn-id: https://plugins.svn.wordpress.org/hs-social-media-buttons/trunk@823711 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improved Readme.txt file

git-svn-id: https://plugins.svn.wordpress.org/hs-social-media-buttons/trunk@823717 b8457f37-d9ea-0310-8a92-e5e31aec5664
Improved Readme.txt file

git-svn-id: https://plugins.svn.wordpress.org/hs-social-media-buttons/trunk@823721 b8457f37-d9ea-0310-8a92-e5e31aec5664