chore(package): update documentation to version 5.1.1

Closes #3

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
   },
   "dependencies": [],
   "devDependencies": {
-    "documentation": "^4.0.0-beta.18",
+    "documentation": "^5.1.1",
     "meta-dev": "^0.4.2"
   },
   "eslintConfig": {