Prepare for 3.0.6 release

Author: kabalin

docs/CHANGELOG.md

@@ -9,6 +9,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 The format of this change log follows the advice given at [Keep a CHANGELOG](http://keepachangelog.com).
 
 ## [Unreleased]
+No unreleased changes.
+
+## [3.0.6] - 2021-02-08
 ### Fixed
 - `moodle-plugin-ci grunt` should also be using `npx grunt` internally
 
@@ -323,7 +326,8 @@ The format of this change log follows the advice given at [Keep a CHANGELOG](htt
 - `moodle-plugin-ci shifter` command.  Run YUI Shifter on plugin YUI modules.
 - `moodle-plugin-ci csslint` command.  Lints the CSS files in the plugin.
 
-[Unreleased]: https://github.com/moodlehq/moodle-plugin-ci/compare/3.0.5...master
+[Unreleased]: https://github.com/moodlehq/moodle-plugin-ci/compare/3.0.6...master
+[3.0.6]: https://github.com/moodlehq/moodle-plugin-ci/compare/3.0.5...3.0.6
 [3.0.5]: https://github.com/moodlehq/moodle-plugin-ci/compare/3.0.4...3.0.5
 [3.0.4]: https://github.com/moodlehq/moodle-plugin-ci/compare/3.0.3...3.0.4
 [3.0.3]: https://github.com/moodlehq/moodle-plugin-ci/compare/3.0.2...3.0.3