add changes entry

ocaml-ppx · Apr 14, 2022 · 5f93803 · 5f93803
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+Unreleased
+-----
+  * **BREAKING:** Rewrite `ppx_import` as a context free rule. It changes the syntax of the type declaration from:
+
+  ```ocaml
+  type loc = [%import: Location.t];;
+  ```
+
+  to:
+
+  ```ocaml
+  [%%import : type loc = Location.t]
+  (* or *)
+  type%import loc = Location.t
+  ```
+
 1.9.1
 -----