fix(deps): update dependency grunt-contrib-clean to v2

This MR contains the following updates:

Package	Change	Age	Confidence
grunt-contrib-clean	~0.6.0 -> ~2.0.0

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Release Notes

gruntjs/grunt-contrib-clean (grunt-contrib-clean)

v2.0.1

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• Update deps (#​117) 518aa72
• Update deps, clean up (#​116) d226900
• Bump async from 2.6.1 to 3.2.2 (#​113) 395bb66
• Bump path-parse from 1.0.5 to 1.0.7 (#​112) b94a81e
• Bump js-yaml from 3.5.5 to 3.14.1 (#​111) 897e872
• Bump hosted-git-info from 2.6.0 to 2.8.9 (#​110) 947a601
• Bump lodash from 4.17.15 to 4.17.21 (#​109) 569bf5f
• Bump grunt from 1.0.3 to 1.3.0 (#​108) 2d125d1
• Bump lodash from 4.17.10 to 4.17.15 (#​104) c1882fa

v2.0.0

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v1.1.0

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v1.0.0

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v0.7.0

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