Updated changelog.md

Author: ProtocolNebula

changelog.md

@@ -6,6 +6,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.1.0] - 2021-01-02
+
+### Changed
+- Forced `groupName` (class name) to CapitalCase (UpperCamelCase).
+> Please check and update your code after generate the template.
+
 ## [2.0.3] - 2021-01-02
 
 ### Fixed