Use github personal access token if provided in env

[znck]

This PR includes

• Use GITHUB_PERSONAL_ACCESS_TOKEN if defined in env

Fixes #368

[posva]

I'd actually call it GITHUB_TOKEN because I already have a variable with that name in a .tokenrc file I just source. So I think it would be better to pass an option to the cli so users can pass their tokens as they want and detect this error to point them how to use a custom token (there must be some kind of gh blog post about it)

[znck]

That would be better.

So, --token would set github personal access token.

Should it load GITHUB_TOKEN from env. ( 😑 it cumbersome to add token every time vue list is called)

[zigomir]

@znck there is not a lot api rate limit exceeded issues reported no more. But, this simple fix is probably still very valuable to people who gets it. I think we'd need to add a clear documentation on how to specify GITHUB_TOKEN to make this work; Link to GitHub Personal Access Tokens and describe every step.

What do you think?

[yyx990803]

Thanks for the PR and sorry for letting it sit for so long. As of now, we are no longer adding new features of vue-cli 2.x, so I am closing this PR. Again, thanks for the contribution.