Update grunt-contrib-watch requirement from ~1.0.0 to ~1.1.0

Updates the requirements on [grunt-contrib-watch](https://github.com/gruntjs/grunt-contrib-watch) to permit the latest version.
- [Release notes](https://github.com/gruntjs/grunt-contrib-watch/releases)
- [Changelog](https://github.com/gruntjs/grunt-contrib-watch/blob/master/CHANGELOG)
- [Commits](gruntjs/grunt-contrib-watch@v1.0.0...v1.1.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -15,7 +15,7 @@
     "grunt-contrib-copy": "~1.0.0",
     "grunt-contrib-sass": "~1.0.0",
     "grunt-contrib-uglify": "~4.0.1",
-    "grunt-contrib-watch": "~1.0.0",
+    "grunt-contrib-watch": "~1.1.0",
     "grunt-exec": "~1.0.1",
     "grunt-open": "0.2.3",
     "matchdep": "~1.0.1"