Update pubspec.yaml (#89)

* Update pubspec.yaml

* update the changelog
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6fe56ae..7111004 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
-## 2.2.2-dev
+## 2.2.2
 
-- Require Dart 2.19
+- Added package topics to the pubspec file.
+- Require Dart 2.19.
 
 ## 2.2.1
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 72768f6..abee9c9 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,8 +1,11 @@
 name: benchmark_harness
-version: 2.2.2-dev
+version: 2.2.2
 description: The official Dart project benchmark harness.
 repository: https://github.com/dart-lang/benchmark_harness
 
+topics:
+ - benchmarking
+
 environment:
   sdk: '>=2.19.0 <3.0.0'