Update CHANGELOG.md

Author: aritchie

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Fixes
+
+- Map iOS native events - OnCrashedLastRun and BeforeSend ([#2102](https://github.com/getsentry/sentry-dotnet/pull/3958))
+
 ## 5.1.1
 
 ### Fixes
@@ -10,7 +16,6 @@
 - Fixed envelopes with oversized attachments getting stuck in __processing ([#3938](https://github.com/getsentry/sentry-dotnet/pull/3938))
 - Unknown stack frames in profiles on .NET 8+ ([#3942](https://github.com/getsentry/sentry-dotnet/pull/3942))
 - Deduplicate profiling stack frames ([#3941](https://github.com/getsentry/sentry-dotnet/pull/3941))
-- Map iOS native events - OnCrashedLastRun and BeforeSend ([#2102](https://github.com/getsentry/sentry-dotnet/pull/3958))
 - OperatingSystem will now return macOS as OS name instead of 'Darwin' as well as the proper version. ([#2710](https://github.com/getsentry/sentry-dotnet/pull/3956))
 - Ignore null value on CocoaScopeObserver.SetTag ([#3948](https://github.com/getsentry/sentry-dotnet/pull/3948))
 - Deduplicate profiling stack frames ([#3969](https://github.com/getsentry/sentry-dotnet/pull/3969))