Added travis ci support for modern node versions

[amilajack]

No description provided.

[twolfson]

Can we also add "5" and drop "iojs" from this list?

[amilajack]

Sure thing! Fixed.

[twolfson]

You stripped away the quotes, please keep them for reducing the noise in this PR =/

[twolfson]

Looks like too much was fixed in that last commit. Left another comment. Can you please squash the commits into 1 commit as well?

[amilajack]

I haven't squashed a commit before. How would I do that?

[twolfson]

Run git rebase -i master and change all commits except for the first 1 to "squash". Here's a demonstration:

https://ariejan.net/2011/07/05/git-squash-your-latests-commits-into-one/

Once the commits are squashed into 1, you will need to force push the update. That can be done via:

git push origin patch-1 --force

[dawsbot]

Why don't we have node v6 being tested in this PR? Just joining this discussion.

[twolfson]

It is in this PR, maybe you are viewing a subset of the commits?

https://github.com/uber/image-diff/pull/41/files#diff-354f30a63fb0907d4ad57269548329e3R3

https://travis-ci.org/uber/image-diff/jobs/145087157

[amilajack]

The command

git push origin patch-1 --force

isnt working for me. It's returning Everything up-to-date but the squash doesnt seem to be pushed.

[twolfson]

You need to run the git rebase -i master first and choose "squash" for all but the first commit as instructed =/

[twolfson]

Also, make sure you are on the patch-1 branch when running git rebase

[amilajack]

I see. Can I close this PR and make a new one with these revisions?

[twolfson]

You can but you should be able to do everything on this branch/PR =/