Update CHANGELOG

Author: zihejia

CHANGELOG.md

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 #
 
+## [v1.3.1](https://github.com/mixpanel/mixpanel-react-native/tree/v1.3.1) (2021-07-29)
+
+### Fixes
+
+- Fix the inconsistency typescript definition of init [\#78](https://github.com/mixpanel/mixpanel-react-native/pull/78)
+
+**Closed issues:**
+
+- confusion re documentation [\#77](https://github.com/mixpanel/mixpanel-react-native/issues/77)
+
+**Merged pull requests:**
+
+- Add more sample apps for integrating Mixpanel including using Context API [\#79](https://github.com/mixpanel/mixpanel-react-native/pull/79)
+
+#
+
 ## [v1.3.0](https://github.com/mixpanel/mixpanel-react-native/tree/v1.3.0) (2021-07-28)
 
 **Closed issues:**
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+
+