chore(package): update documentation to version 8.1.1

Closes #8

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
   "devDependencies": {
     "babel-preset-env": "^1.2.2",
     "clone": "^2.1.1",
-    "documentation": "^5.3.3",
+    "documentation": "^8.1.1",
     "meta-dev": "^0.4.2",
     "pre-commit": "^1.1.3",
     "spy": "^1.0.0"