Merge pull request #49 from kaitlinnewson/patch-1

Remove gitter and update slack

learners/discuss.md

@@ -4,10 +4,7 @@ title: Discussion
 
 There are many ways to discuss Library Carpentry lessons:
 
-- Join our [Gitter discussion forum](https://gitter.im/LibraryCarpentry/).
-- Join our [Slack organisation](https://swc-slack-invite.herokuapp.com/) and #libraries channel.
+- Join our [Slack organisation](https://slack-invite.carpentries.org/) and #libraries channel.
 - Stay in touch with our [Topicbox Group](https://carpentries.topicbox.com/groups/discuss-library-carpentry).
 - Follow updates on [Twitter](https://twitter.com/LibCarpentry).
 - Make a suggestion or correct an error by [raising an Issue](https://github.com/LibraryCarpentry/lc-open-refine/issues).
-
-