7.5.2 changelog (#2593)

CHANGELOG.md

@@ -1,13 +1,18 @@
 See the [releases](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases) for details on bug fixes and added features.
 
-Pending Next Release:
+7.5.2
 =====
 ### Bug Fixes:
 - Validate authentication tag length so a JWE with appended characters will not be considered a valid token. See issues [#2201](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/2201), [#1641](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/1641), PR [#2569](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2569), and [IDX10625 Wiki](IDX10625) for details. 
 
 ### Fundamentals:
 - App Context Switches in Identity Model 7x are now documented [here](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/wiki/App-Context-Switches-in-IdentityModel-7x).
 
+### Performance Improvements:
+- In .NET 6 or greater, use a temporary buffer to reduce intermediate allocation in `VerifyRsa`/`VerifyECDsa`. See PR [#2589](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2589) for more details.
+- Reduce allocations in `ValidateSignature` by using a collection expression instead of `new List<SecurityKey> { key }`, to optimize for the single element case. See PR [#2586](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2586) for more details.
+- Remove Task allocation in `AadIssuerValidator`. See PR [#2584](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/pull/2584) for more details.
+
 7.5.1
 =====
 ### Performance Improvements: