CHANGELOG.md in graphql-metrics-3.0.2 vs CHANGELOG.md in graphql-metrics-3.0.3

@@ -1,4 +1,9 @@
+3.0.3
+-----
+
+- [#22](https://github.com/Shopify/graphql-metrics/pull/22) Optimization: use hash assignment over merge
+
 3.0.2
 -----
 
 - [#21](https://github.com/Shopify/graphql-metrics/pull/21) Optimize empty document check