doc: update CHANGELOG for 2.7.8

[skip ci]

Author: flavorjones

CHANGELOG.md

@@ -7,6 +7,11 @@
   In advance of the upcoming TailwindCSS v4 release, we are decoupling the `tailwindcss` executable from the Rails integration. This will allow users to upgrade TailwindCSS at a time of their choosing, and allow early adopters to start using the beta releases.
 
 
+## v2.7.8 / 2024-10-08
+
+* Fix the scaffold form template to render checkboxes properly. (#416) @enderahmetyurt
+
+
 ## v2.7.7 / 2024-10-02
 
 * Proactively support changes to Rails's authentication templates shipping in Rails 8.0.0.beta2 (which is not yet released). (#407, #408) @seanpdoyle @flavorjones