add display npm version

[ghost]

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[jelbourn]

@iloveyo123u1 our npm package actually isn't material2. Try this instead:

Also please sign the CLA; we can't accept any contributions without it.

[z11h]

fixed in #285

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