docs: update changelog

CHANGELOG.md

@@ -1,3 +1,20 @@
+## 4.0.0-dev.1
+- **CustomRefreshIndicator**:
+  - Removed deprecated parameters: *indicatorCancelDuration*, *indicatorSettleDuration*, *indicatorFinalizeDuration* and *completeStateDuration* .If you are still using them, switch to the *duration* parameter.
+- **IndicatorController**:
+  - Added *minValue* and *maxValue* static constants.
+  - Added *transform* method. Allows you to transform controller animation values from the range *0.0* → *1.5* to another range.
+  - Added *normalize* method. Normalizes *value* by converting it to the range *0.0* → *1.0*. This allows the animation to be used directly with most Flutter widgets and tweens. You can still use *clamp* if you want to remove values above *1.0* instead of transforming the whole range.
+- **CustomMaterialIndicator**:
+  - Redesigned/reimplemented. Now, when *indicatorBuilder* argument is not provided, it completely recreates the look and behavior of the built-in *RefreshIndicator* widget.
+  - Added *CustomMaterialIndicator.adaptive* constructor.
+  - *indicatorBuilder* parameter is now optional.
+  - The deprecated parameter *withRotation* has been removed. It was confusing and was not related to the material indicator design. To add rotation to the indicator, you need to implement rotation yourself 😔.
+  - Added *color*, *semanticsValue*, *semanticsLabel* and *strokeWidth* parameters. They are applied only when the default *indicatorBuilder* is used (given a null value).
+- Removed deprecated *IndicatorBuilderDelegate* and *MaterialIndicatorDelegate* classes.
+- Added *TransformedAnimation* class that allows transforming the parent animation value.
+- **Example app**:
+  - Updated custom material indicator example. 
 ## 3.1.1
 - Fix:
   - Fixed *durations* parameter of *CustomRefreshIndicator* widget. Reported by [@jccd1996](https://github.com/jccd1996) in [#58](https://github.com/gonuit/flutter-custom-refresh-indicator/issues/58).