update readme to reflect that we can't automagically inject an auto_discovery_link_tag yet.
update readme to reflect that we can't automagically inject an auto_discovery_link_tag yet.

krisquigley/refinerycms-news,refinery/refinerycms-news,wuboy0307/refinerycms-news,ipmobiletech/refinerycms-news,ipmobiletech/refinerycms-news,krisquigley/refinerycms-news,wuboy0307/refinerycms-news,refinery/refinerycms-news