upgrade to grunt-html-validation v0.1.11

package.json

@@ -34,7 +34,7 @@
     "grunt-contrib-uglify": "~0.2.4",
     "grunt-contrib-watch": "~0.5.3",
     "grunt-csscomb": "~1.1.0",
-    "grunt-html-validation": "~0.1.6",
+    "grunt-html-validation": "~0.1.11",
     "grunt-jekyll": "~0.4.0",
     "grunt-jscs-checker": "~0.2.5",
     "grunt-saucelabs": "~4.1.2",