chore: add changelog

Author: ChiragAgg5k

CHANGELOG.md

@@ -1 +1,9 @@
-# Change Log
+# Change Log
+
+## 18.0.0
+
+* Add `<REGION>` to doc examples due to the new multi region endpoints
+* Remove `Gif` from ImageFormat enum
+* Remove `search` param from `listExecutions` method
+* Add `token` param to `getFilePreview` and `getFileView` for File tokens usage
+* Improve CORS error catching in `client.call` method