add stub entry about Buttons changes to the migration guide

diff --git a/docs/migration.md b/docs/migration.md
index 48ab9776fc294faefb5453e659cd9683341dc831..d1b4686cb94feb70d0a8d1a1b50240e81a43cfa5 100644 (file)
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -32,6 +32,7 @@ This table shows the style changes between v3.x.x and v4.0.0.
 | Carousel's `.item` | `.carousel-item` |
 | Tabs | |
 | Pills | |
+| Buttons | |
 
 ## What's new
 We've added new components and changed some existing ones. Here are the new or updated styles.