add change entry

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/utils/change_tracker.rs

@@ -411,4 +411,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "`./x run` now supports running in-tree `rustfmt`, e.g., `./x run rustfmt -- --check /path/to/file.rs`.",
     },
+    ChangeInfo {
+        change_id: 119899,
+        severity: ChangeSeverity::Warning,
+        summary: "Stage0 library no longer matches the in-tree library, which means stage1 compiler now uses the beta library.",
+    },
 ];