Add indeterminate to rlsnotes

RELEASE-NOTES.md

@@ -33,6 +33,8 @@
 - **API** - API callbacks now have an `onResponse` callback that can adjust a servers response before it is parsed by other callbacks for success or failure conditions. **Thanks @mnquintana**
 - **API** - API now provides a local caching setting to avoid server roundtrips for identical urls by using `cache: 'local'`. This is not enabled by default.  Local caching is useful for results that should return the same values across a single session, for example when querying an autocomplete.
 - **Card** - Cards now support multiple custom `content` blocks. Content blocks and images can now appear in any order.
+- **Checkbox** - Added support for `indeterminate` checkboxes, along with new stylings.
+- **Checkbox** - Now includes separate behaviors for triggering state changes without callbacks
 - **Dropdown** - Added remote API integration with dropdown, to allow `search selection` to query against a remote dataset.
 - **Dropdown** - Dropdowns now automatically observe changes in `menu` and will update selector cache with new additions
 - **Dropdowns** - Added ability to add custom choices to all search selection dropdowns (multi/single) using `allowAdditions: true` setting. Search now displays error messages on no results in all cases.
@@ -72,6 +74,7 @@
 - **Build Tools** - Build tools will now display pre-specified errors when a theme file is missing or an element specifies an unavailable theme.
 - **Build Tools** - Adjusting `site.variables` will now rebuild all UI, instead of just `site.less`
 - **Button** - Added `:focus` styles for all button types, all button examples in docs now are keyboard focusable using either `<button>` or `tabindex` where appropriate.
+- **Checkbox** - Reduced size of icon font
 - **Divider** - `vertical divider` inside `ui grid` now accounts for column padding
 - **Dropdown** - Nested `scrolling` menus now support keyboard selection, e.g. pressing "A" for apple, and keyboard scrolling.
 - **Dropdown** - Dropdowns now have `match` setting to specify whether to match on `text`, `value` or `both`