altered readme.txt file

git-svn-id: https://plugins.svn.wordpress.org/fix-duplicates/trunk@869991 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating readme.txt

git-svn-id: https://plugins.svn.wordpress.org/fix-duplicates/trunk@869995 b8457f37-d9ea-0310-8a92-e5e31aec5664