Update Dockerfile link to 0.6.2

ghost/README.md

@@ -1,6 +1,6 @@
 # Supported tags and respective `Dockerfile` links
 
--	[`0.6.0`, `0.6`, `0`, `latest` (*Dockerfile*)](https://github.com/docker-library/ghost/blob/7afddd95e2826213657961ba91208efcd0cb5c12/Dockerfile)
+-	[`0.6.2`, `0.6`, `0`, `latest` (*Dockerfile*)](https://github.com/docker-library/ghost/blob/44ea66fd79706fc25609c90de4af161b5ed94681/Dockerfile)
 
 For more information about this image and its history, please see the [relevant manifest file (`library/ghost`)](https://github.com/docker-library/official-images/blob/master/library/ghost) in the [`docker-library/official-images` GitHub repo](https://github.com/docker-library/official-images).