chore(deps): update dependency grunt-shell to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt-shell	0.6.4 -> 3.0.1

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Release Notes

sindresorhus/grunt-shell

v3.0.1

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• Fix broken chalk upgrade 1361a33

v3.0.0

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Breaking:

• Require Node.js >=6 and Grunt >=1 62cdda5

Other:

• Allow functions as shorthand commands (#​118) 86680b4

v2.1.0

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v2.0.0

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v1.3.1

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v1.3.0

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v1.2.1

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v1.2.0

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v1.1.2

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v1.1.1

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v1.1.0

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v1.0.1

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v1.0.0

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v0.7.0

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The options stdout, stderr and failOnError defaults changed from false to true to match user expectations.

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[coveralls]

Coverage remained the same at 95.066% when pulling 5751881 on renovate/grunt-shell-3.x into 133d7f1 on master.

[coveralls]

Coverage remained the same at 95.066% when pulling 5751881 on renovate/grunt-shell-3.x into 133d7f1 on master.