Merge branch 'feature/remove-custom-keepalive'

Author: letsar

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.5
+### Changed
+* Use the new SliverWithKeepAliveWidget.
+
 ## 0.2.4
 ### Fixed
 * Dart 2.1 mixin support.

README.md

@@ -28,7 +28,7 @@ In the `pubspec.yaml` of your flutter project, add the following dependency:
 ```yaml
 dependencies:
   ...
-  flutter_staggered_grid_view: "^0.2.4"
+  flutter_staggered_grid_view: "^0.2.5"
 ```
 
 In your library add the following import:

lib/src/rendering/sliver_variable_size_box_adaptor.dart

@@ -161,6 +161,7 @@ abstract class RenderSliverVariableSizeBoxAdaptor extends RenderSliver
     with
         TileContainerRenderObjectMixin<RenderBox,
             SliverVariableSizeBoxAdaptorParentData>,
+        RenderSliverWithKeepAliveMixin,
         RenderSliverHelpers {
   /// Creates a sliver with multiple box children.
   ///