Update grunt-eslint to version 17.3.2 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

grunt-eslint just published its new version 17.3.2, 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-eslint – 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 4 commits .

• 4c6a79b 17.3.2
• 7954851 don't log newline when no output
• 9f593a9 Merge pull request #102 from ntwb/patch-1
• 24912ca Travis CI: Test on Node.js v4.x.x and v5.x.x

See the full diff.

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