Change readme.txt file.

git-svn-id: https://plugins.svn.wordpress.org/elegant-themes-icons/trunk@940254 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme.txt file.

git-svn-id: https://plugins.svn.wordpress.org/elegant-themes-icons/trunk@940255 b8457f37-d9ea-0310-8a92-e5e31aec5664