Update twitter account

Author: tamalsaha

README.md

@@ -1,6 +1,6 @@
 [![Docker Pulls](https://img.shields.io/docker/pulls/appscode/stash.svg)](https://hub.docker.com/r/appscode/stash/)
 [![Slack](https://slack.appscode.com/badge.svg)](https://slack.appscode.com)
-[![Twitter](https://img.shields.io/twitter/follow/appscodehq.svg?style=social&logo=twitter&label=Follow)](https://twitter.com/intent/follow?screen_name=AppsCodeHQ)
+[![Twitter](https://img.shields.io/twitter/follow/kubestash.svg?style=social&logo=twitter&label=Follow)](https://twitter.com/intent/follow?screen_name=KubeStash)
 
 # Stash installer