updating release notes

docs/ReleaseHistory.md

@@ -13,6 +13,7 @@
 
 # UNRELEASED
 - DEP: `System.Text.Json` updated to `v8.0.4` to resolve Depandabot alert.
+- BRK: `Scan` struct now comprises a `ScanEngine` and a `ScanState` instance. Scan information, such as `checks`, must be accessed via the `ScanState` field of the `Scan` struct. 
 
 # 1.5.2 - 07/05/2024
 - NEW: Added an initial secret redaction capability to the Rust package.