Changelog: add #13450

Author: jeherve

readme.txt

@@ -112,6 +112,7 @@ There are opportunities for developers at all levels to contribute. [Learn more
 **Improved compatibility**
 
 * AMP: ensure that one can use the Slideshow and the MailChimp blocks when using the AMP plugin.
+* AMP: suppor the new Dev mode for Notifications and Stats features.
 * Admin Page: improve compatibility with themes and plugins that insert CSS in the dashboard.
 * Blocks: ensure that all blocks display well in the editor when using WordPress 5.3.
 * Carousel: ensure that the feature works with the new gallery markup introduced in WordPress 5.3.