Update README.md

README.md

@@ -4,7 +4,7 @@ Crowi - The Simple & Powerful Communication Tool Based on Wiki
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-[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/crowi/crowi/tree/v1.4.0)
+[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/crowi/crowi/tree/v1.5.0)
 
 [![Circle CI](https://circleci.com/gh/crowi/crowi.svg?style=svg)](https://circleci.com/gh/crowi/crowi)
 [![Join the chat at https://gitter.im/crowi/general](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/crowi/general)
@@ -40,7 +40,6 @@ Dependencies
 * Elasticsearch (optional)
 * Redis (optional)
 * Amazon S3 (optional)
-* Facebook Application (optional)
 * Google Project (optional)
 * Slack App (optional)