Update uncss

package.json

@@ -31,7 +31,7 @@
     "rimraf": "^2.6.2",
     "typedoc": "^0.8.0",
     "typescript": "^2.8.3",
-    "uncss": "^0.14.1",
+    "uncss": "^0.16.2",
     "vinyl": "^0.5.3"
   }
 }