Newsletter 4: Add discussion links

Author: ozkriff

content/posts/newsletter-004/index.md

@@ -805,12 +805,9 @@ That's all news for today, thanks for reading!
 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/e7xdwf/this_month_in_rust_gamedev_4_november_2019),
+[twitter](https://twitter.com/rust_gamedev/status/1203745439243223044).
 
 [/r/rust_gamedev]: https://reddit.com/r/rust_gamedev
 [@rust_gamedev]: https://twitter.com/rust_gamedev