Update grunt-contrib-clean requirement from ~0.5.0 to ~2.0.0

[dependabot-preview[bot]]

Updates the requirements on grunt-contrib-clean to permit the latest version.

Changelog

Sourced from grunt-contrib-clean's changelog.

v2.0.0: date: 2018-09-08 changes: - Update all dependencies. - Drop Node.js < 6 support. v1.1.0: date: 2017-04-12 changes: - Update grunt to 1.0.0. - Updates to docs and changelog. - Update internal modules. v1.0.0: date: 2016-02-15 changes: - Drop support for Node.js v0.8. - Grunt peer dependency tagged >= 0.4.5. - Dependency updates. v0.7.0: date: 2015-11-13 changes: - Dependency updates. v0.6.0: date: 2014-07-27 changes: - Less verbose output. - README updates. v0.5.0: date: 2013-07-15 changes: - Use rimraf directly, version 2.2.1 to fix issue on Windows. - Add no-write option to mimic grunt.file.delete behavior. v0.4.1: date: 2013-04-16 changes: - Check if file exists to avoid trying to delete a non-existent file. v0.4.0: date: 2013-02-15 changes: - First official release for Grunt 0.4.0. v0.4.0rc6: date: 2013-01-18 changes: - Updating grunt/gruntplugin dependencies to rc6. - Changing in-development grunt/gruntplugin dependency versions from tilde version ranges to specific versions. v0.4.0rc5: date: 2013-01-09 changes: - Updating to work with grunt v0.4.0rc5. - Switching to this.filesSrc API. v0.4.0a:

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