Bump grunt from 1.2.0 to 1.2.1 (#246)

Bumps [grunt](https://github.com/gruntjs/grunt) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/gruntjs/grunt/releases)
- [Changelog](https://github.com/gruntjs/grunt/blob/master/CHANGELOG)
- [Commits](gruntjs/grunt@v1.2.0...v1.2.1)

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