Use scalacenter/bsp gitter channel now

Author: jvican

blog/_posts/2018-06-10-bsp.md

@@ -201,8 +201,8 @@ and [open](https://github.com/scalacenter/bsp/issues/14) tickets.
 
 If you want to help integrating BSP in your favorite editor or IDE, or you'd
 like to help test the integrations, join our
-[`scala/center`](https://gitter.im/scala/center/) Gitter channel and let's
-discuss ways we can work together.
+[`scalacenter/bsp`](https://gitter.im/scalacenter/bsp) Gitter channel and
+let's discuss ways we can work together.
 
 ## Acknowledgements