Updated readme.txt format

git-svn-id: https://plugins.svn.wordpress.org/acf-enhanced-message-field/trunk@1049403 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated readme.txt format

git-svn-id: https://plugins.svn.wordpress.org/acf-enhanced-message-field/trunk@1049408 b8457f37-d9ea-0310-8a92-e5e31aec5664