Updated Slack info link

The previous link was linking to an old Slack announcement--the newer link points directly to the Slack community info page which is more detailed and has up to date info (http://creativecommons.github.io/community/#slack)

Author: sgrepos

content/contents.lr

@@ -14,7 +14,7 @@ You can contribute to CC's software in a few different ways.
 
 Using our software (such as [the new version of CC Search](http://ccsearch.creativecommons.org/)) and letting us know how it's working for you is very helpful. General suggestions, bug reports, a request to build a new feature –  any form of feedback is excellent, no matter how small.
 
-You can send us feedback in a few different ways. If you have a GitHub account, [creating a GitHub issue](https://help.github.com/articles/creating-an-issue/) is easiest for us because that's where we track our work. If you know which GitHub repository (see [a full list here](/projects)) corresponds to the software about which you'd like to give us feedback, then please create an issue attached to that repository. If you're not sure what that means or you don't know the correct repository, please create an issue [on the creativecommons.org repository](https://github.com/creativecommons/creativecommons.org/issues). You can also send us feedback in the `#cc-usability` channel [on the CC Slack community](https://creativecommons.org/2016/10/18/slack-announcement/) or via email at `software@creativecommons.org`.
+You can send us feedback in a few different ways. If you have a GitHub account, [creating a GitHub issue](https://help.github.com/articles/creating-an-issue/) is easiest for us because that's where we track our work. If you know which GitHub repository (see [a full list here](/projects)) corresponds to the software about which you'd like to give us feedback, then please create an issue attached to that repository. If you're not sure what that means or you don't know the correct repository, please create an issue [on the creativecommons.org repository](https://github.com/creativecommons/creativecommons.org/issues). You can also send us feedback in the `#cc-usability` channel [on the CC Slack community](http://creativecommons.github.io/community/#slack) or via email at `software@creativecommons.org`.
 
 ### Contributing code