changelog entry

Signed-off-by: Arseniy Alekseyev <[email protected]>

CHANGES.md

@@ -87,6 +87,12 @@ unreleased
 - Fix generation of `.merlin` whenever there's more than one stanza with the
   same ppx preprocessing specification (#2209 ,fixes #2206, @rgrinberg)
 
+- Add a new config option sandboxing_preference and the corresponding cli
+  argument `--sandbox`, which lets the user control the level of sandboxing 
+  dune does by default. The individual build rules can override this setting. 
+  The rules  defined in `dune` files are currently not sandboxed. 
+  (#2213, @aalekseyev)
+
 1.9.3 (06/05/2019)
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