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 devDependency grunt-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.

• ea0548b 3.1.0
• 8b3fa28 Update imagemin deps to fix tunnel-agent 0.4.3 vulnerability
• 72d2a32 package.json: add individual scripts.
• 021bf3d Update .editorconfig to match the current state.
• 861d695 readme.md: use uls.
• af5923a Remove unneeded use strict statements.

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[greenkeeper]

• The devDependency grunt-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.

• 7e61b18 Merge pull request #393 from gruntjs/fix-up-xo
• 2cf6a34 Update deps
• bc556d2 Merge pull request #392 from whyisjake/issue-391
• 2917a2a Rollback AVA a bit.
• aa7a9ca Security Audit Fixes.

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