Prepare release v1.2.0 (#82)

Co-authored-by: Abhinav Gupta <abg@uber.com>

CHANGELOG.md

@@ -4,31 +4,48 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [1.2.0]
+### Added
+- Add Cleanup option that can be used for registering cleanup callbacks. (#78)
+
+### Changed
+- Mark VerifyNone as a test helper. (#75)
+
+Thanks to @tallclair for their contribution to this release.
+
+[1.2.0]: https://github.com/uber-go/goleak/compare/v1.1.12...v1.2.0
+
 ## [1.1.12]
 ### Fixed
 - Fixed logic for ignoring trace related goroutines on Go versions 1.16 and above.
 
+[1.1.12]: https://github.com/uber-go/goleak/compare/v1.1.11...v1.1.12
+
 ## [1.1.11]
 ### Fixed
 - Documentation fix on how to test.
 - Update dependency on stretchr/testify to v1.7.0. (#59)
 - Update dependency on golang.org/x/tools to address CVE-2020-14040. (#62)
 
+[1.1.11]: https://github.com/uber-go/goleak/compare/v1.1.10...v1.1.11
+
 ## [1.1.10]
 ### Added
 - [#49]: Add option to ignore current goroutines, which checks for any additional leaks and allows for incremental adoption of goleak in larger projects.
 
 Thanks to @denis-tingajkin for their contributions to this release.
 
+[#49]: https://github.com/uber-go/goleak/pull/49
+[1.1.10]: https://github.com/uber-go/goleak/compare/v1.0.0...v1.1.10
+
 ## [1.0.0]
 ### Changed
 - Migrate to Go modules.
 
 ### Fixed
 - Ignore trace related goroutines that cause false positives with -trace.
 
+[1.0.0]: https://github.com/uber-go/goleak/compare/v0.10.0...v1.0.0
+
 ## 0.10.0
 - Initial release.
-
-[1.0.0]: https://github.com/uber-go/goleak/compare/v0.10.0...v1.0.0
-[#49]: https://github.com/uber-go/goleak/pull/49