chore(package): update typedoc to version 0.15.8

Closes #11

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "nyc": "^13.3.0",
     "ts-node": "^8.0.3",
     "tslint": "^5.14.0",
-    "typedoc": "^0.14.2",
+    "typedoc": "^0.15.8",
     "typescript": "^3.3.3333"
   },
   "author": "Mateo Gianolio",