CHANGELOG.md in aws-sdk-cloudwatch-1.51.0 vs CHANGELOG.md in aws-sdk-cloudwatch-1.52.0

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+ new

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 Unreleased Changes
 ------------------
 
+1.52.0 (2021-07-26)
+------------------
+
+* Feature - SDK update to support creation of Cross-Account Metric Alarms and update API documentation.
+
 1.51.0 (2021-03-30)
 ------------------
 
 * Feature - SDK update for new Metric Streams feature
 
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