Update changelog

CHANGELOG.md

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 ## [Unreleased]
 
-### Summary
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 ### Breaking changes
 
 ### Changed
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 -->
 
-## [Unreleased]
-
-### Summary
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-### Breaking changes
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-### Changed
+## [v0.38.0]
 
 ### Added
 
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 * Expose signer methods for `Client` ([Yuki Kishimoto])
 * Add `SendEventOutput` ([Yuki Kishimoto])
 
-### Fixed
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-### Removed
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-### Deprecated
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 <!-- Contributors -->
 [Yuki Kishimoto]: https://yukikishimoto.com
 [J. Azad EMERY]: https://github.com/ethicnology
 
 <!-- Tags -->
-[Unreleased]: https://github.com/rust-nostr/nostr-sdk-flutter/compare/v0.37.0...HEAD
+[Unreleased]: https://github.com/rust-nostr/nostr-sdk-flutter/compare/v0.38.0...HEAD
+[v0.38.0]: https://github.com/rust-nostr/nostr-sdk-flutter/compare/5030349e7e13a96c00416f40d9aacd318a8dd978...v0.38.0