Prepare to nullsafety.1 release

Author: Kamil Klyta

CHANGELOG.md

@@ -1,5 +1,5 @@
 
-## 1.0.0
+## 1.0.0-nullsafety.1
 - Stable nullsafety release.
 - **BREAKING**: Removed `prevState` from `IndicatorController` class.
   Because flutter only marks the widget that it is ready for rebuild, it is possible that the controller state will change more than once during a single frame what causes one or more steps to be skipped. To still use `prevState` and `didChangeState` method, you can use `IndicatorStateHelper`. Take a look at `check_mark_indicator.dart` or `warp_indicator.dart` for example usage.

example/pubspec.lock

@@ -49,7 +49,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "1.0.0"
+    version: "1.0.0-nullsafety.1"
   fake_async:
     dependency: transitive
     description:

pubspec.yaml

@@ -1,6 +1,6 @@
 name: custom_refresh_indicator
 description: Flutter Widget that make it easy to implement custom refresh indicator.
-version: 1.0.0
+version: 1.0.0-nullsafety.1
 repository: https://github.com/gonuit/flutter-custom-refresh-indicator
 issue_tracker: https://github.com/gonuit/flutter-custom-refresh-indicator/issues
 homepage: https://github.com/gonuit/flutter-custom-refresh-indicator