Merge pull request #2689 from wcampbell0x2a/add-rsadsb-to-2021-12-15

Add rsadsb v0.4.0 to this-week-in-rust

Author: nellshamrell

draft/2021-12-15-this-week-in-rust.md

@@ -19,6 +19,7 @@ If you find any errors in this week's issue, [please submit a PR](https://github
 ### Foundation
 
 ### Project/Tooling Updates
+* [Announcing rsadsb v0.4.0: View Airplanes in the sky with Rust](https://rsadsb.github.io/v0.4.0.html)
 
 ### Observations/Thoughts