Added missing changlog entry for #14255

actionview/CHANGELOG.md

+*   Fixed a problem where the default options for the `button_tag` helper is not
+    applied correctly.
+
+    Fixes #14254.
+
+    *Sergey Prikhodko*
+
 Please check [4-1-stable](https://github.com/rails/rails/blob/4-1-stable/actionview/CHANGELOG.md) for previous changes.