updated gravityforms-html5-placeholders readme.txt 


git-svn-id: https://plugins.svn.wordpress.org/gravityforms-html5-placeholders/trunk@975349 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated changelog section of readme.txt

git-svn-id: https://plugins.svn.wordpress.org/gravityforms-html5-placeholders/trunk@975350 b8457f37-d9ea-0310-8a92-e5e31aec5664