chore(package): update metalsmith-permalinks to version 2.0.0

Closes #34

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "metalsmith-markdown-sections": "^0.3.1",
     "metalsmith-moment": "^1.0.0",
     "metalsmith-multi-language": "^0.2.0",
-    "metalsmith-permalinks": "^0.5.0",
+    "metalsmith-permalinks": "^2.0.0",
     "metalsmith-sitemap": "^1.1.0",
     "metalsmith-tags": "^2.0.0",
     "moment": "^2.20.1",