Update version and changelog

Author: nohli

CHANGELOG.md

@@ -1,6 +1,10 @@
+## 0.3.1
+
+* Fix `namespace` for `Android Gradle Plugin` versions < 7
+
 ## 0.3.0
 
-* Add `namespace` for compatibility with Android Gradle Plugin 8
+* Add `namespace` for compatibility with `Android Gradle Plugin 8`
 * Update `Gradle` version
 
 ## 0.2.0

pubspec.yaml

@@ -6,7 +6,7 @@ issue_tracker: https://github.com/fluttercommunity/android_id/issues
 
 maintainer: Joachim Nohl (@nohli)
 
-version: 0.3.0
+version: 0.3.1
 
 environment:
   sdk: '>=2.12.0 <3.0.0'