Update CHANGELOG.md

CHANGELOG.md

@@ -7,6 +7,18 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [0.13.1] - 2020-08-21
+
+### Changed
+
+* Improve `std::fmt::Debug` implementation for `Client` (PR #216).
+* Several API documentation improvements.
+
+### Fixed
+
+* Fix infinite loop upon encountering invalid UTF-8 characters in an incoming
+  message (PR #215).
+
 ## [0.13.0] - 2020-08-20
 
 ### Changed
@@ -347,8 +359,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   * `textDocument/hover`
   * `textDocument/documentHighlight`
 
-[Unreleased]: https://github.com/ebkalderon/tower-lsp/compare/v0.13.0...HEAD
-[0.12.1]: https://github.com/ebkalderon/tower-lsp/compare/v0.12.1...v0.13.0
+[Unreleased]: https://github.com/ebkalderon/tower-lsp/compare/v0.13.1...HEAD
+[0.13.1]: https://github.com/ebkalderon/tower-lsp/compare/v0.13.0...v0.13.1
+[0.13.0]: https://github.com/ebkalderon/tower-lsp/compare/v0.12.1...v0.13.0
 [0.12.1]: https://github.com/ebkalderon/tower-lsp/compare/v0.12.0...v0.12.1
 [0.12.0]: https://github.com/ebkalderon/tower-lsp/compare/v0.11.0...v0.12.0
 [0.11.0]: https://github.com/ebkalderon/tower-lsp/compare/v0.10.1...v0.11.0