CHANGELOG.md in aws-sdk-pinpoint-1.56.0 vs CHANGELOG.md in aws-sdk-pinpoint-1.57.0

@@ -1,7 +1,12 @@
 Unreleased Changes
 ------------------
 
+1.57.0 (2021-09-16)
+------------------
+
+* Feature - This SDK release adds a new feature for Pinpoint campaigns, in-app messaging.
+
 1.56.0 (2021-09-01)
 ------------------
 
 * Feature - Code Generated Changes, see `./build_tools` or `aws-sdk-core`'s CHANGELOG.md for details.
 
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