Update grunt-contrib-imagemin to the latest version 🚀

[greenkeeper]

The devDependency grunt-contrib-imagemin was updated from 2.0.1 to 3.1.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Your Greenkeeper bot 🌴

[miketaylr]

This version is not covered by your current version range.

ok, helpful.

There's no CHANGELOG for this repo, but looking at the commits, it seems like they just dropped support for old nodejs versions, and added a new concurrency option (as well as some minor docs things):

gruntjs/grunt-contrib-imagemin@v2.0.1...master

[miketaylr]

@karlcow this bot doesn't follow our PR title conventions -- does that break your changelog tooling? Should we update the titles before merging them?

[miketaylr]

Working locally.

[miketaylr]

LGTM to merge, but I want to wait on @karlcow's feedback on the title format for these kinds of bot PRs.

[karlcow]

LGTM to merge, but I want to wait on @karlcow's feedback on the title format for these kinds of bot PRs.

I can adjust the script so the changelog tool is taking into account this. wdyt? if yes open an issue and assign it to me?

[miketaylr]

if yes open an issue and assign it to me?

sure thing!