Update changelog to v1.21 (#393)

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [Unreleased]
 
+## [1.21.0] 2018-10-15
 ### Added
 - Option to archive teams
 - Added pusher-fake to the project
@@ -13,7 +14,6 @@
 - Fixed `story-description` and `.note` by adding to sortable column canceled elements/nodes
 - Fix calculation of first sprint size
 
-
 ### Changed
 - pusherSockets.js to allow empty pusher env vars
 
@@ -304,7 +304,7 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com)
 and this project adheres to [Semantic Versioning](http://semver.org).
 
-[Unreleased]: https://github.com/Codeminer42/cm42-central/compare/v1.20.1...HEAD
+[Unreleased]: https://github.com/Codeminer42/cm42-central/compare/v1.21.0...HEAD
 [1.0.0]: https://github.com/Codeminer42/cm42-central/tree/v1.0.0
 [1.1.0]: https://github.com/Codeminer42/cm42-central/tree/v1.1.0
 [1.1.1]: https://github.com/Codeminer42/cm42-central/tree/v1.1.1
@@ -333,3 +333,4 @@ and this project adheres to [Semantic Versioning](http://semver.org).
 [1.19.0]: https://github.com/Codeminer42/cm42-central/tree/v1.19.0
 [1.20.0]: https://github.com/Codeminer42/cm42-central/tree/v1.20.0
 [1.20.1]: https://github.com/Codeminer42/cm42-central/tree/v1.20.1
+[1.21.0]: https://github.com/Codeminer42/cm42-central/tree/v1.21.0