[Core] Release 1.9.1 (#959)

* [Core] Release 1.9.1

* Update src/Core/CHANGELOG.md

Co-authored-by: Robin Chalas <chalasr@users.noreply.github.com>

Co-authored-by: Robin Chalas <chalasr@users.noreply.github.com>

Author: Nyholm

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## NOT RELEASED
 
+## 1.9.1
+
+### Fixed
+
+- Make sure mocked results have a response with `Response::$bodyDownloaded = true`.
+
 ## 1.9.0
 
 ### Added