Update dependency grunt to ~1.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt (source)	~1.5.0 -> ~1.6.0

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Release Notes

gruntjs/grunt (grunt)

v1.6.1

Compare Source

• Changelog updates 72f6f03
• Merge pull request #​1755 from gruntjs/rm-dep 8d4c183
• Add recursive 1c7d483
• Merge pull request #​1756 from gruntjs/downgrade-glob 2d4fd38
• Downgrade glob 902db7c
• Fix syntax 494f243
• remove mkdirp b01389e
• remove dep on rimraf and mkdirp 0072510

v1.6.0

Compare Source

• Merge pull request #​1750 from gruntjs/dep-update-jan28 2805dc3
• README updates 3f1e423
• Bump to 16 8fd096d
• Update more deps 42c5f95
• Bump eslint and node version 1d88050

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