Add Kraken CI

Add Kraken CI

README.md

@@ -213,6 +213,7 @@ Please read [CONTRIBUTING](./CONTRIBUTING.md) if you wish to add software.
 * [GitLab CI](https://www.gitlab.com/gitlab-ci/) - Based off of ruby. They also provide GitLab, which manages git repositories.
 * [Go](http://www.go.cd/) - Open source continuous delivery server.
 * [Jenkins](http://jenkins-ci.org/) - An extendable open source continuous integration server.
+* [Kraken CI](https://kraken.ci/) - A modern CI/CD, open-source, on-premise system that is highly scalable and focused on testing.
 * [Concourse CI](https://concourse.ci/) - A pipeline-based CI system written in Go.
 * [Spinnaker](http://www.spinnaker.io/) - Open source, multi-cloud continuous delivery platform for releasing software changes.
 * [TeamCity](https://www.jetbrains.com/teamcity/) - Powerful Continuous Integration out of the box