bug: the response objects cannot be converted to json

[wunglee]

found bug in page : https://docs.steamship.com/packages/developing/project-structure.html:

Create or reuse an instance of the package

instance = Steamship.use("my-package", "instance-id")

Invoke the methods

hello_resp = instance.invoke("say_hello", verb="GET", name="Ted")
do_resp = instance.invoke("do_something", number=5)

the two invoke will return empty {}，the response objects cannot be converted to json.

bug is in version 2.17.11

[dkolas]

Thanks again. These docs were also out of date. PR is in for fixing them.