Merge pull request #15463 from twbs/bump-less

Bump grunt-contrib-less to ~1.0.0

package.json

@@ -45,7 +45,7 @@
     "grunt-contrib-cssmin": "~0.11.0",
     "grunt-contrib-jade": "~0.14.0",
     "grunt-contrib-jshint": "~0.10.0",
-    "grunt-contrib-less": "~0.12.0",
+    "grunt-contrib-less": "~1.0.0",
     "grunt-contrib-qunit": "~0.5.2",
     "grunt-contrib-uglify": "~0.7.0",
     "grunt-contrib-watch": "~0.6.1",