build(deps-dev): bump grunt-contrib-jshint from 1.1.0 to 2.1.0

Bumps [grunt-contrib-jshint](https://github.com/gruntjs/grunt-contrib-jshint) from 1.1.0 to 2.1.0.
- [Release notes](https://github.com/gruntjs/grunt-contrib-jshint/releases)
- [Changelog](https://github.com/gruntjs/grunt-contrib-jshint/blob/master/CHANGELOG)
- [Commits](gruntjs/grunt-contrib-jshint@v1.1.0...v2.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -38,7 +38,7 @@
     "coveralls": "^3.0.2",
     "grunt": "^1.0.3",
     "grunt-cli": "^1.2.0",
-    "grunt-contrib-jshint": "^1.0.0",
+    "grunt-contrib-jshint": "^2.1.0",
     "grunt-contrib-nodeunit": "^2.0.0",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-git-authors": "^3.2.0",