Link to paperclip-dropbox gem in the readme

README.md

@@ -269,7 +269,8 @@ Paperclip ships with 3 storage adapters:
 If you would like to use Paperclip with another storage, you can install these
 If you would like to use Paperclip with another storage, you can install these
 gems along side with Paperclip:
 gems along side with Paperclip:
 
 
-* [Windows Azure](https://github.com/gmontard/paperclip-azure-storage)
+* [paperclip-azure-storage](https://github.com/gmontard/paperclip-azure-storage)
+* [paperclip-dropbox](https://github.com/janko-m/paperclip-dropbox)
 
 
 ### Understanding Storage
 ### Understanding Storage