chore(package): update typedoc to version 0.15.1

Closes #86

Author: greenkeeper[bot]

package.json

@@ -59,7 +59,7 @@
     "mocha-performance": "0.1.1",
     "nyc": "11.8.0",
     "swagger-tools": "0.10.4",
-    "typedoc": "^0.12.0",
+    "typedoc": "^0.15.1",
     "typedoc-plugin-external-module-name": "^1.1.1",
     "v8-profiler": "5.7.0"
   },