Merge pull request #86 from tloudon/patch-1

Update index.md

Author: jc00ke

index.md

@@ -46,7 +46,7 @@ There are many ways to participate in **pdxruby**:
     to tell the world that you're part of this user group and find
     others.
 -   [Chat with us on IRC: "\#pdxruby"](irc://irc.freenode.net/#pdxruby)
--   [Chat with us on Slack](https://pdxruby-slack.herokuapp.com/)
+-   [Chat with us on Slack](https://pdxruby.slack.com)
 -   [Watch videos of past meetings on YouTube](https://www.youtube.com/channel/UCgEEluMvb1Fp3FExqh-YZmw)
 -   [Follow our Code of Conduct](/CONDUCT)
 -   Edit this page! (See also: [the wiki joke](/wikijoke))