Update CHANGELOG.md

CHANGELOG.md

@@ -4,6 +4,14 @@
 
 ### Features/Changes
 - Change slider widget input to a percent value and add docs for it [#276](https://github.com/lapce/floem/pull/276)
+- Add flight booker example from 7gui [#280](https://github.com/lapce/floem/pull/280)
+- Add timer example from 7gui [#284](https://github.com/lapce/floem/pull/284)
+- Add more grid properties [#285](https://github.com/lapce/floem/pull/285)
+- Add `value_container` for provide `on_update` to checkbox [#290](https://github.com/lapce/floem/pull/290)
 
 ### Bug Fixes
 - Fix a panic when multiple views have context menus [#275](https://github.com/lapce/floem/pull/275)
+- Fix slider and add example [#279](https://github.com/lapce/floem/pull/279)
+
+### Internal Changes
+- Add `update_state_deferred` and `simplify update_state` [#277](https://github.com/lapce/floem/pull/277)