chore(package): update dependencies

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "babel-preset-latest": "^6.16.0",
     "codeclimate-test-reporter": "^0.4.0",
     "coveralls": "^2.11.15",
-    "esdoc": "^0.4.8",
+    "esdoc": "^0.5.1",
     "nyc": "^10.0.0"
   },
   "homepage": "https://aureooms.github.io/js-red-black-tree",