Changelog: add #14928

Author: jeherve

readme.txt

@@ -103,7 +103,7 @@ There are opportunities for developers at all levels to contribute. [Learn more
 
 **Major Enhancements**
 
-*
+* This release introduces a new Podcast Player block to list and play your favorite podcasts.
 
 **Enhancements**
 

to-test.md

@@ -1,5 +1,11 @@
 ## 8.4
 
+### Blocks
+
+#### Podcast Player
+
+We've created a new Podcast Player block that will allow you to quickly embed and play podcasts within your posts and pages. Give the block and its options a try, and let us know if you run into any issues.
+
 ### Others
 
 - If you have the opportunity to test in an older browser like IE11, please do so. You may catch some interesting bugs!