Newsletter 2: Add discussion links (#27)

Author: ozkriff

_posts/2019-10-05-newsletter-002.md

@@ -655,12 +655,9 @@ Want something mentioned in the next newsletter?
 Also, subscribe to [@rust_gamedev on Twitter][@rust_gamedev]
 or [/r/rust_gamedev subreddit][/r/rust_gamedev] if you want to receive fresh news!
 
-<!--
-TODO: Add real links and un-comment once this post is published
 **Discussions of this post**:
-[/r/rust](TODO),
-[twitter](TODO).
--->
+[/r/rust](https://reddit.com/r/rust/comments/ddtbpm/this_month_in_rust_gamedev_2_september_2019),
+[twitter](https://twitter.com/rust_gamedev/status/1180590459913035776).
 
 [/r/rust_gamedev]: https://reddit.com/r/rust_gamedev
 [@rust_gamedev]: https://twitter.com/rust_gamedev