Update grunt-contrib-imagemin to the latest version 🚀

[greenkeeper]

The devDependency grunt-contrib-imagemin was updated from 2.0.1 to 3.0.0.

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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[greenkeeper]

• The devDependencygrunt-contrib-imagemin was updated from 2.0.1 to 3.1.0.

Update to this version instead 🚀

Commits

The new version differs by 6 commits.

• ea0548b3.1.0
• 8b3fa28Update imagemin deps to fix tunnel-agent 0.4.3 vulnerability
• 72d2a32package.json: add individual scripts.
• 021bf3dUpdate .editorconfig to match the current state.
• 861d695readme.md: use uls.
• af5923aRemove unneeded use strict statements.

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[greenkeeper]

• The devDependencygrunt-contrib-imagemin was updated from 2.0.1 to 4.0.0.

Update to this version instead 🚀

Commits

The new version differs by 5 commits.

• 7e61b18Merge pull request #393 from gruntjs/fix-up-xo
• 2cf6a34Update deps
• bc556d2Merge pull request #392 from whyisjake/issue-391
• 2917a2aRollback AVA a bit.
• aa7a9caSecurity Audit Fixes.

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