[flutter_plugin_android_lifecycle] Bump version for NNBD stable (#3569)

diff --git a/packages/flutter_plugin_android_lifecycle/CHANGELOG.md b/packages/flutter_plugin_android_lifecycle/CHANGELOG.md
index e1804c5..08f137c 100644
--- a/packages/flutter_plugin_android_lifecycle/CHANGELOG.md
+++ b/packages/flutter_plugin_android_lifecycle/CHANGELOG.md
@@ -1,15 +1,8 @@
-## 2.0.0-nullsafety.2
+## 2.0.0
 
+* Bump Dart SDK for null-safety compatibility.
 * Fix outdated links across a number of markdown files ([#3276](https://github.com/flutter/plugins/pull/3276))
 
-## 2.0.0-nullsafety.1
-
-* Fix example app SDK.
-
-## 2.0.0-nullsafety
-
-* Bump Dart SDK.
-
 ## 1.0.12
 
 * Update Flutter SDK constraint.
diff --git a/packages/flutter_plugin_android_lifecycle/pubspec.yaml b/packages/flutter_plugin_android_lifecycle/pubspec.yaml
index d94237c..3f6ccb0 100644
--- a/packages/flutter_plugin_android_lifecycle/pubspec.yaml
+++ b/packages/flutter_plugin_android_lifecycle/pubspec.yaml
@@ -1,10 +1,10 @@
 name: flutter_plugin_android_lifecycle
 description: Flutter plugin for accessing an Android Lifecycle within other plugins.
-version: 2.0.0-nullsafety.2
+version: 2.0.0
 homepage: https://github.com/flutter/plugins/tree/master/packages/flutter_plugin_android_lifecycle
 
 environment:
-  sdk: ">=2.12.0-0 <3.0.0"
+  sdk: ">=2.12.0-259.9.beta <3.0.0"
   flutter: ">=1.12.13"
 
 dependencies: