update README to notify dropping plan to integrate with content management API (#32)

Author: shieldo

README.md

@@ -1,10 +1,15 @@
 contentful
 ==========
 
-Provides integrations with the Contentful APIs (Content Delivery and Content Management) for PHP 5.6+
+Provides integrations with Contentful APIs (Delivery and Preview) for PHP 5.6+.
 
-Status: Content Delivery API support is complete. No integration with Content Management API yet - though work forthcoming and PRs welcome!
+There is an official Contentful PHP SDK now ([contentful/contentful](https://packagist.org/packages/contentful/contentful)) - so use what makes sense for you. This package has been in large-scale production for over two years now, and I am focusing on making it the fastest client available for fetching Contentful data.
 
-Will tag a 1.0 release (CDA support only) when sufficient documentation is written.
+Previous aspirations to integrate with Contentful's Content Management API are now dropped - please look to Contentful to support that.
+
+Documentation
+-------------
+
+I know this is sorely missing - _mea culpa_. Docs will be forthcoming.
 
 [![Build Status](https://api.travis-ci.org/usemarkup/contentful.png?branch=master)](http://travis-ci.org/usemarkup/contentful)