Update CHANGELOG

Author: zihejia

CHANGELOG.md

@@ -1,5 +1,17 @@
 #
 
+## [v4.2.0](https://github.com/mixpanel/mixpanel-swift/tree/v4.2.0) (2023-11-13)
+
+### Enhancements
+
+- add a new property 'flushBatchSize' for fine tuning the network request [\#617](https://github.com/mixpanel/mixpanel-swift/pull/617)
+
+### Fixes
+
+- Fixes so project builds for visionOS [\#618](https://github.com/mixpanel/mixpanel-swift/pull/618)
+
+#
+
 ## [v4.1.4](https://github.com/mixpanel/mixpanel-swift/tree/v4.1.4) (2023-07-19)
 
 ### Fixes
@@ -386,6 +398,8 @@ When you call the API `createAlias`, there is an implicit `identify` call inside
 
 
 
+
+