Release 0.1.6 version

• update CHANGELOG.md;
• change the chart version in Chart.yaml;
• change the default image.tag and initImage.tag in values.yaml to the new version (e.g., "0.1.3");
• create a git tag for the new version (e.g., "0.1.3") and push it to Gitlab (any branch will do); the CI will create and push docker images tagged by that same version string. (You can push all git tags using git push --tags, or this specific one using git push origin 0.1.3.)