Create a command for adding the labels to a github repository

[bytesnz]

Update package so that it can be installed globally to create the label-me command for adding the labels to a repository

label-me <user/repo> <api_token>

[Relequestual]

Thanks for this @bytesnz
I've not published a node module before. If I were to accept this PR, what would I need to do to publish it?

[bytesnz]

Theoretically, you should only need to run npm publish (create an account on npm and then run npm login if you haven't already done so before you run npm publish)
https://docs.npmjs.com/cli/login
https://docs.npmjs.com/cli/publish

[Relequestual]

Thanks.
There may be some delay in me actually doing this, but it's on my radar.