Update node-etcd to the latest version 🚀

[greenkeeper]

The dependency node-etcd was updated from 5.1.0 to 7.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[CLAassistant]

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