docs(changelog): fix markdown headings for 0.6.0 and 0.5.0 releases

Author: remarkablemark

CHANGELOG.md

@@ -3,7 +3,7 @@
 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.
 
 <a name="0.6.0"></a>
-# [0.6.0](https://github.com/remarkablemark/html-react-parser/compare/v0.5.0...v0.6.0) (2018-12-17)
+## [0.6.0](https://github.com/remarkablemark/html-react-parser/compare/v0.5.0...v0.6.0) (2018-12-17)
 
 
 ### Features
@@ -13,7 +13,7 @@ All notable changes to this project will be documented in this file. See [standa
 
 
 <a name="0.5.0"></a>
-# [0.5.0](https://github.com/remarkablemark/html-react-parser/compare/v0.4.7...v0.5.0) (2018-12-16)
+## [0.5.0](https://github.com/remarkablemark/html-react-parser/compare/v0.4.7...v0.5.0) (2018-12-16)
 
 
 ### Bug Fixes