chore(deps-dev): bump grunt from 1.2.1 to 1.3.0 (#239)

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.2.1 to 1.3.0.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/master/CHANGELOG)
- [Commits](gruntjs/grunt@v1.2.1...v1.3.0)

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