docs(changelog): fix heading for 1.2.7

Author: remarkablemark

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
-### [1.2.7](https://github.com/remarkablemark/html-react-parser/compare/v1.2.6...v1.2.7) (2021-06-19)
+## [1.2.7](https://github.com/remarkablemark/html-react-parser/compare/v1.2.6...v1.2.7) (2021-06-19)
 
 ## [1.2.6](https://github.com/remarkablemark/html-react-parser/compare/v1.2.5...v1.2.6) (2021-04-18)