v1.2.4

Full Changelog

Changed

• Upgrades js-yaml to 3.12.1 (#107) (@tjorim)
• Upgrades node-red-contrib-cast to 0.2.4 (#108) (@tjorim)
• Upgrades add-on base image to 2.3.1
• Configure Renovate (#106)
• Refactor of GitLab CI
• Removes Greenkeeper
• Updates maintenance year to 2019
• Moves Python requirements out of the Dockerfile
• Removes greenkeeper from README
• Fixes MarkdownLint warnings

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