Add node6 to ci

[chicoxyzzy]

• Add Node.js 6 LTS to CI
• Drop unmaintained versions of Node.js from package.json

[msftclas]

Hi @chicoxyzzy, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla.microsoft.com.

TTYL, MSBOT;

[RyanCavanaugh]

@dotnet-bot test ci please

[chicoxyzzy]

Is it ok that there are no running tests for Node 6 on .NET CI?

[RyanCavanaugh]

@dotnet-bot test this please

[RyanCavanaugh]

The jobs have to be manually enabled after they're created - figuring out how to get that rolling here. Is there an issue tracking this PR?

[chicoxyzzy]

I didn't find any.

Also I've singed CLA. Should I call some bot to check it?

[msftgits]

Hi, I am closing and re-opening this PR to bump the CLA bot. Sorry for the inconvenience!

[msftclas]

Hi @chicoxyzzy, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!
You've already signed the contribution license agreement. Thanks!

The agreement was validated by Microsoft and real humans are currently evaluating your PR.

TTYL, MSBOT;