Build: Add Node 6.x to Travis

[dannyfritz]

Finishing what #57 started.

[eslintbot]

Thanks for the pull request, @dannyfritz! I took a look to make sure it's ready for merging and found some changes are needed:

• Pull requests with code require an issue to be mentioned at the end of the commit summary, such as (fixes #1234). Please update the commit summary with an issue (file a new issue if one doesn't already exist).

Can you please update the pull request to address these?

(More information can be found in our pull request guide.)

[eslintbot]

LGTM

[eslintbot]

LGTM

[eslintbot]

LGTM

[eslintbot]

LGTM

[nzakas]

Any way we can pull the version from package.json so we don't have to worry about keeping the versions in sync?

[dannyfritz]

We could add this as a devDependency and run it instead. https://www.npmjs.com/package/npm-install-peers

[nzakas]

Also, this should be "Build:"

[eslintbot]

LGTM

[dannyfritz]

Oh geez, 0.12 can't run npm-install-peers:

const chalk = require('chalk')
^^^^^
SyntaxError: Use of const in strict mode.

---

I found an answer that uses sed to do it, but don't want to commit it because I don't understand it. npm/npm#11213 (comment)

[eslintbot]

LGTM

[dannyfritz]

Working with npm-install-peers to resolve this: spatie/npm-install-peers#2

[eslintbot]

LGTM

[JamesHenry]

@nzakas I am wondering if node 0.12 should even be a consideration at this point... It's maintenance support will be discontinued at the end of the year, and node 4.x has long since been the LTS.

It would really surprise me if there are many users of TypeScript and node 0.12 as a combination out there.

What do you think?

[eslintbot]

LGTM

[dannyfritz]

Got a PR in for npm-install-peers and this should be good to go now.

spatie/npm-install-peers#3

[nzakas]

LGTM