Updated CHANGELOG.md for 2.7.0 release

Author: bUnitBot

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.7.0] - 2021-04-29
+
 Added workflow diagram.
 
 ## [2.1.0] - 2021-04-27
@@ -35,7 +37,9 @@ Testing 3 . 2 . 1
 
 Testing one toooo three
 
-[Unreleased]: https://github.com/bUnit-dev/workflows/compare/v2.1.0...HEAD
+[Unreleased]: https://github.com/bUnit-dev/workflows/compare/v2.7.0...HEAD
+
+[2.7.0]: https://github.com/bUnit-dev/workflows/compare/v2.1.0...v2.7.0
 
 [2.1.0]: https://github.com/bUnit-dev/workflows/compare/v2.0.1...v2.1.0