Update @polymer/lit-element to the latest version 🚀

[greenkeeper[bot]]

The dependency @polymer/lit-element was updated from 0.6.5 to 0.7.0.

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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Your Greenkeeper bot :palm_tree:

[PalatinCoder]

• [ ] use static get styles()

[greenkeeper[bot]]

• The dependency @polymer/lit-element was updated from 0.6.5 to 0.7.1.

Update to this version instead 🚀

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The new version differs by commits.

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[PalatinCoder]

in favor of #29