docs: Update CHANGELOG

CHANGELOG.md

@@ -6,7 +6,28 @@
 ### Workflow
 ### Tests
 ### Others
- -->
+-->
+
+## 0.1.0
+
+### Features
+- `CalendarComponentDayGrid` (and all other grid-based components) now passes its index in its `itemBuilder` to allow for more powerful customisation/handling of UI.
+- `CalendarComponentDayGrid` (and all other grid-based components) now has exactly two constructors: a `.overflow` and `noOverflow` to handle overflowing weeks more easily.
+- The `.single` and `.multiple` constructors have been removed from `CalendarComponentSelectableDayGrid` in favour of `.overflow` and `.noOverflow`. Because of this, single and multiple selection is now separated into two widgets: `CalendarComponentSingleSelectableDayGrid` and `CalendarComponentMultipleSelectableDayGrid`.
+- `RangedSelectionState` has been renamed to `SelectedDateRangeState` and `selectedEnd` has been removed.
+- Certain useful `DateTime` extensions have been exported out to the library.
+
+### Documentation
+- Added documentation for relevant classes.
+
+### Workflow
+- Added CI.
+
+### Tests
+- Updated tests to match current API.
+
+### Others
+- Update example to use the ranged day grid.
 
 ## 0.0.1