Update CHANGELOG

Author: zihejia

CHANGELOG.md

@@ -1,5 +1,13 @@
 #
 
+## [v1.3.9](https://github.com/mixpanel/mixpanel-react-native/tree/v1.3.9) (2022-03-02)
+
+**Merged pull requests:**
+
+- bump mixpanel-swift to 3.1.5 [\#129](https://github.com/mixpanel/mixpanel-react-native/pull/129)
+
+#
+
 ## [v1.3.8](https://github.com/mixpanel/mixpanel-react-native/tree/v1.3.8) (2022-02-25)
 
 ### Enhancements
@@ -168,6 +176,8 @@
 
 
 
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+