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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt-shell	^2.1.0 -> ^3.0.0

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Release Notes

sindresorhus/grunt-shell

v3.0.1

Compare Source

• Fix broken chalk upgrade 1361a33

v3.0.0

Compare Source

Breaking:

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

Other:

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

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[coveralls]

Coverage remained the same at 90.076% when pulling 92431fc on renovate/grunt-shell-3.x into 01c1f59 on master.

[coveralls]

Coverage remained the same at 90.076% when pulling 92431fc on renovate/grunt-shell-3.x into 01c1f59 on master.