Add entry about stateful buttons to v4 migration guide

Refs #18459, #17178
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Chris Rebert 2015-12-07 16:48:22 -08:00
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@ -85,6 +85,8 @@ New to Bootstrap 4 is the Reboot, a new stylesheet that builds on Normalize with
- Renamed `.btn-default` to `.btn-secondary`.
- Dropped the `.btn-xs` class entirely.
- The [stateful button](http://getbootstrap.com/javascript/#buttons-methods) feature of the `button.js` jQuery plugin has been dropped. This includes the `$().button(string)` and `$().button('reset')` methods. We advise using a tiny bit of custom JavaScript instead, which will have the benefit of behaving exactly the way you want it to.
- Note that the other features of the plugin (button checkboxes, button radios, single-toggle buttons) have been retained in v4.
### Grid system