node-client/src: change license from Unlicense to Apache-2.0

[nikhita]

Part of kubernetes/sig-release#223 and kubernetes/steering#57:

In the kubernetes-client javascript repo, a package.json file was added stating that the kubernetes-client-typescript package is under the Unlicense. Can this be corrected to Apache-2.0?

[nikhita]

/cc @brendanburns @justaugustus
/assign @brendanburns

[k8s-ci-robot]

@nikhita: GitHub didn't allow me to assign the following users: brendanburns.

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In response to this:

/cc @brendanburns @justaugustus
/assign @brendanburns

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[k8s-ci-robot]

@nikhita: GitHub didn't allow me to request PR reviews from the following users: brendanburns, justaugustus.

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In response to this:

/cc @brendanburns @justaugustus
/assign @brendanburns

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[justaugustus]

/lgtm
/cc @brendandburns
/assign @brendandburns

[k8s-ci-robot]

@justaugustus: changing LGTM is restricted to assignees, and only kubernetes-client/javascript repo collaborators may be assigned issues.

In response to this:

/lgtm
/cc @brendandburns
/assign @brendandburns

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