fix(package): update apidoc to version 0.20.1

Closes #49

Author: greenkeeper[bot]

package.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "@types/amqplib": "^0.5.4",
     "amqplib": "^0.5.2",
-    "apidoc": "^0.17.6",
+    "apidoc": "^0.20.1",
     "axios": "^0.19.2",
     "base-64": "^0.1.0",
     "debug": "^4.0.0",