Readme - update
FIX - Netbilling requires two decimals for checkout even if no decimals is used in points.
FIX - Replaced sanitize_key with sanitize_text_field in gateway abstract class for point type keys.

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@1044955 b8457f37-d9ea-0310-8a92-e5e31aec5664