Add fix to release notes
* `DockerRegistryCredentials` implements `PasswordCredentials` interface - [Pull Request 655](https://github.com/bmuschko/gradle-docker-plugin/pull/655)
* `DockerCreateContainer` gained `pid` option - [Pull Request 652](https://github.com/bmuschko/gradle-docker-plugin/pull/652)
+* `Dockerfile` validation takes into account comments - [Issue 657](https://github.com/bmuschko/gradle-docker-plugin/issues/657)
### Version 3.6.1 (August 21, 2018)
* Task `DockerClient`, and the passed dockerClient object, is now cached by configuration - [Pull Request 644](https://github.com/bmuschko/gradle-docker-plugin/pull/644)
