Update grunt-contrib-imagemin to version 1.0.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

grunt-contrib-imagemin just published its new version 1.0.1, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of grunt-contrib-imagemin – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 11 commits .

• 6759219 1.0.1
• 92963f1 Check fordata.contentsexistence
• 1065131 Merge pull request #355 from gruntjs/deps
• 7fa79e7 Update dependencies.
• 2e9096a Upgrade grunt and devDeps to 1.0
• 17c1bbe Update CHANGELOG.
• 8b3bd14 Point main to task
• 7e0609f Remove peerDeps. Ref gruntjs/grunt#1116
• fb9b928 Update copyright to 2016
• b38ce54 Close #338 PR: Fixed heading style in readme.
• a19e5c8 CI: Remove node.js '0.12' and add '5'.

See the full diff.

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