chore(package): update documentation to version 9.0.0

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "@babel/preset-env": "^7.0.0-beta.51",
     "ava": "^0.25.0",
     "babel-plugin-lodash": "^3.3.4",
-    "documentation": "^8.0.0",
+    "documentation": "^9.0.0",
     "documentation-theme-bespoke": "^0.3.5",
     "gulp": "^4.0.0",
     "gulp-better-rollup": "^3.2.1",