bump readme for 3.1.6

readme.txt

@@ -125,6 +125,19 @@ CoBlocks is designed to support the last two major versions of WordPress that ar
 
 == Changelog ==
 
+= 3.1.6 / 2024-02-28 =
+
+# Enhancements
+* Introduce a blueprint for WordPress preview [#2580](https://github.com/godaddy-wordpress/coblocks/pull/2580)
+
+# Bug fix
+* Load extension styles for core blocks [#2591](https://github.com/godaddy-wordpress/coblocks/pull/2591)
+* Fix Lightbox for all CoBlocks galleries [#2589](https://github.com/godaddy-wordpress/coblocks/pull/2589)
+* Fix Lightbox with A3 Lazy Loading plugin [#2588](https://github.com/godaddy-wordpress/coblocks/pull/2588)
+
+# Misc
+* Encode URI component in Typography settings [#2584](https://github.com/godaddy-wordpress/coblocks/pull/2584)
+
 = 3.1.5 / 2023-11-06 =
 
 # Enhancements