Update CHANGELOG.md

Author: skttl

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- Clear earlier serverside validation errors #217
 - Null Pointer Exception on save when no grid layout selected #211
 - Unsaved Changes dialog fires when hitting submit on grid editors #205
 
@@ -50,4 +51,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [1.2.1]: https://github.com/skttl/umbraco-doc-type-grid-editor/compare/1.2.0...1.2.1
 [1.2.0]: https://github.com/skttl/umbraco-doc-type-grid-editor/compare/1.1.0...1.2.0
 [1.1.0]: https://github.com/skttl/umbraco-doc-type-grid-editor/compare/1.0.0...1.1.0
-[1.0.0]: https://github.com/skttl/umbraco-doc-type-grid-editor/releases/tag/1.0.0
+[1.0.0]: https://github.com/skttl/umbraco-doc-type-grid-editor/releases/tag/1.0.0