chore: add changelog

Author: ChiragAgg5k

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Change Log
 
+## 15.1.0
+
+* Add `incrementDocumentAttribute` and `decrementDocumentAttribute` support to `Databases` service
+* Add `gif` support to `ImageFormat` enum
+* Add `dart38` and `flutter332` support to runtime models
+* Add `encrypt` support to `StringAttribute` model
+* Add `sequence` support to `Document` model
+* Add `upsertDocument` support to `Databases` service
+
 ## 15.0.0
 
 * Add `<REGION>` to doc examples due to the new multi region endpoints
@@ -10,4 +19,4 @@
 * Updates enum for `runtimes` with Pythonml312, Dart219, Flutter327 and Flutter329
 * Add `token` param to `getFilePreview` and `getFileView` for File tokens usage
 * Add `queries` and `search` params to `listMemberships` method
-* Removes `search` param from `listExecutions` method
+* Removes `search` param from `listExecutions` method