Update CHANGELOG.md

Author: alanjcharles

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file. See [standa
 
 ### [1.4.9](https://github.com/segmentio/analytics-react-native/compare/v1.4.8...v1.4.9) (2021-06-21)
 
+- bump Mixpanel and Facebook IOS integrations to resolve build issues. 
+
 ### [1.4.8](https://github.com/segmentio/analytics-react-native/compare/v1.4.7...v1.4.8) (2021-05-26)
 
 ### Bug Fixes