meta: Prepare changelog for release
## Unreleased
+**Features**:
+
+- Optionally collect referenced C# file sources when creating a source bundle. ([#516](https://github.com/getsentry/symbolic/pull/516))
+
**Fixes**:
- Only skip one function when encountering unknown Unwind Codes on Windows x64. ([#588](https://github.com/getsentry/symbolic/pull/588))
+- Skip over low_pc sentinels instead of erroring. ([#590](https://github.com/getsentry/symbolic/pull/590))
## 8.7.3
