Update html-minifier to v2.0.0.

Author: XhmikosR

package.json

@@ -17,7 +17,7 @@
   },
   "dependencies": {
     "chalk": "^1.0.0",
-    "html-minifier": "~1.5.0",
+    "html-minifier": "~2.0.0",
     "pretty-bytes": "^3.0.1"
   },
   "devDependencies": {