Update CHANGELOG

Author: zihejia

Diff for: CHANGELOG.md

@@ -1,5 +1,17 @@
 #
 
+## [v1.3.1](https://github.com/mixpanel/mixpanel-flutter/tree/v1.3.1) (2021-09-25)
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+### Enhancements
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+- Migrate from JCenter [\#22](https://github.com/mixpanel/mixpanel-flutter/issues/22)
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+**Merged pull requests:**
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+- Bump native SDK dependencies [\#29](https://github.com/mixpanel/mixpanel-flutter/pull/29)
+
+#
+
 ## [v1.3.0](https://github.com/mixpanel/mixpanel-flutter/tree/v1.3.0) (2021-09-21)
 
 ### Enhancements
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+