[Systems] [Social Help] New Discourse version, update available

[socialhelp at sugarlabs.org]

Hooray, a new version of [Discourse](http://www.discourse.org) is available!

Your version: 1.6.8
New version: **1.7.4**

- Upgrade using our easy **[one-click browser upgrade](http://socialhelp.sugarlabs.org/admin/upgrade)**

- See what's new in the [GitHub changelog](https://github.com/discourse/discourse/commits/master)

- Visit [meta.discourse.org](https://meta.discourse.org) for news, discussion, and support for Discourse
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