Fixes #17631: Add mention of removed .btn-group-justified

It was only available for anchor elements and not button elements, so it was super weird to support. Might be bringing it back with flexbox though in v4 as an option.

diff --git a/docs/migration.md b/docs/migration.md
index 5e7236f8a9b1b425b902a4666cd316786c180d51..ea7c67f65ba2028df0b9761e60fcf985b4d1daea 100644 (file)
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -105,6 +105,7 @@ New to Bootstrap 4 is the Reboot, a new stylesheet that builds on Normalize with
 ### Button group
 
 - Dropped the `.btn-group-xs` class entirely given removal of `.btn-xs`.
+- Removed justified button groups as they were only available for `<a>` elements and not `<button>` elements.
 
 ### Dropdowns