Update CHANGELOG.md

Author: jpnurmi

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+**Breaking**:
+
+- `sentry_value_incref` now returns `sentry_value_t` and `sentry_value_decref` returns `int` (0 if freed). ([#1763](https://github.com/getsentry/sentry-native/pull/1763))
+
 **Fixes**:
 
 - Native/macOS: fix module `image_size` computation, which could have caused the symbolicator to misattribute every frame to the lowest-addressed image (typically `dyld` or `libsystem`). ([#1740](https://github.com/getsentry/sentry-native/pull/1740))
@@ -15,6 +19,7 @@
 - Native/macOS: fix thread stack descriptor. ([#1726](https://github.com/getsentry/sentry-native/pull/1726))
 - Cap rate-limit retry-after values at 24 hours to prevent a MITM-provided response from disabling event delivery for the process lifetime. ([#1744](https://github.com/getsentry/sentry-native/pull/1744))
 - Native: validate ELF header entry sizes. ([#1746](https://github.com/getsentry/sentry-native/pull/1746))
+- Fix TOCTOU races in transaction/span refcounting by switching to the atomic decref return value. ([#1763](https://github.com/getsentry/sentry-native/pull/1763))
 
 ## 0.14.2