docs: update CHANGELOG.md

- Prepends changes from v0.9.27 to v0.9.28.
  Tells v0.9.26 was withdrawn due to missing `dist` folder in the
  package.

CHANGELOG.md

@@ -1,6 +1,13 @@
 # Buefy Changelog
 
-## 0.9.26
+## 0.9.28
+
+### Fixes
+
+* Fix #3961 Dropdown with "hover" trigger incorrectly rendered on mobile devices
+* Fix #3963 no dropdown showed up if the data array was empty and only the footer slot was registered (thanks @GMartigny)
+
+## 0.9.27
 
 ### New features
 
@@ -22,6 +29,10 @@
 * Fix #3939 unnecessary component duplication in navbar-item
 * Fix #3074 Tag with close in tag list produces unwanted offset
 
+## 0.9.26
+
+Withdrawn due to missing `dist` folder in the package.
+
 ## 0.9.25
 
 Include updates on documentation only.