Updated Citra forum link

The Citra forum (discuss.citra-emu.org) has recently been down. The link that has been added 
in this file now leads to an error pages. I update updated the link so it now leads to Citra's new
forum.

CONTRIBUTING.md

 # Reporting Issues
 
-**The issue tracker is not a support forum.** Unless you can provide precise *technical information* regarding an issue, you *should not post in it*. If you need support, first read the [FAQ](https://github.com/citra-emu/citra/wiki/FAQ) and then either visit our IRC channel, [our forum](https://discuss.citra-emu.org/) or ask in a general emulation forum such as [/r/emulation](https://www.reddit.com/r/emulation/). If you post support questions, generic messages to the developers or vague reports without technical details, they will be closed and locked.
+**The issue tracker is not a support forum.** Unless you can provide precise *technical information* regarding an issue, you *should not post in it*. If you need support, first read the [FAQ](https://github.com/citra-emu/citra/wiki/FAQ) and then either visit our IRC channel, [our forum](https://community.citra-emu.org)
+.citra-emu.org/) or ask in a general emulation forum such as [/r/emulation](https://www.reddit.com/r/emulation/). If you post support questions, generic messages to the developers or vague reports without technical details, they will be closed and locked.
 
 If you believe you have a valid issue report, please post text or a screenshot from the log (the console window that opens alongside Citra) and build version (hex string visible in the titlebar and zip filename), as well as your hardware and software information if applicable.