Merge pull request #1830 from reviewdog/massongit-patch-1

CHANGELOG: Add v0.20.0

CHANGELOG.md

@@ -17,6 +17,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### :rotating_light: Breaking changes
 - ...
 
+## [v0.20.0] - 2024-07-07
+
+This version is created by mistake and is the same as v0.19.0.
+We left both versions as-is so that it won't break existing clients who already use v0.20.0.
+
 ## [v0.19.0] - 2024-07-07
 
 ### :rocket: Enhancements