Prepare changelog for next release

Author: PMudra

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 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).
 
-## [1.2.0] - Unreleased
+## [1.2.0] - 2021-03-03
 ### Added
 - Add `keep-a-changelog` as `devDependencies`.
 
@@ -22,5 +22,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Include changed files in `Commit` nodes.
 
-[1.2.0]: https://github.com/gatsbyjs/gatsby-starter-default/compare/v1.1.1...HEAD
+[1.2.0]: https://github.com/gatsbyjs/gatsby-starter-default/compare/v1.1.1...v1.2.0
 [1.1.1]: https://github.com/gatsbyjs/gatsby-starter-default/compare/v1.1.0...v1.1.1