chore: add Node.js 10

[DanielRuf]

Description
This adds Node.js 10 to the CI tests.

Motivation and Context
Test the latest stable release of Node.js.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[DanielRuf]

See nodegit/nodegit#1490

[DanielRuf]

So it does not yet work with Node.js 10.

[alxpez]

@DanielRuf Thanks for your insterest,

Honestly nodegit is a bit of a pain at this point (every time I deploy a release, it takes around 5 minutes to build nodegit binaries from the soruce code), I have to do some test to see if I can get rid of it.

I'll close the PR for now

[DanielRuf]

I have to do some test to see if I can get rid of it.

This is not the issue but the incompatibility.

I would kept it open to track the status of the dependency and try a nodegit update when there is one available.

But I guess I'll try again in the next days and weeks.