reword announcement + discuss added features

Author: dvdsk

outreach/v0.21_announcement.md

@@ -5,23 +5,26 @@
 
 # Announcing rodio 0.21
 
-
 Rodio is an audio playback library. It can decode audio files, synthesize new
 sounds, apply effects to sounds & mix them. Rodio has been part of the Rust
 ecosystem for 9 years now! 🎉.
 
 ## New release
 It's been 5 months since our last release. Since the our team has grown to 3
 maintainers! Thank you Petr and Roderick! And a big thanks for the countless
-other contributors helping out. Thanks to them this release:
+other contributors helping out. Thanks to you all this release:
 
-- Makes the API easier to use
+- Makes the API easier to use:
     - Its now impossible to accidentally drop the `Outputstream`.
     - Our types are no longer generic over sample type.
+- Adds new functionality:
+    - Amplify using decibals or perceptually.
+    - Add a distortion effect.
 - You can use rodio without `cpal` to generate `wav` files! 
 
 There have also been many fixes and smaller additions, take a look at the
 [changelog](https://github.com/RustAudio/rodio/blob/89dac52/CHANGELOG.md)!
 
 ## The future
-We keep working on easy audio playback. We hope to announce something new soon!
+The rust audio organization will keep working on audio in Rust. We hope to
+release an announcement regarding that soon!