Update changelog

CHANGELOG.md

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 * **[Fix]** Fix memory leak during stack trace unwinding.
 * **[Feature]** Add an API to customize data path.
 
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 ## Version 1.8.1
 
 * Re-build Apple Silicon binaries with [Xcode 12.2 Release Candidate](https://developer.apple.com/news/releases/?id=11052020h) to [be able to](https://developer.apple.com/news/releases/?id=11052020i) submit the applications that use the framework as a binary to the App Store.