Update README.md

Author: jtc42

README.md

@@ -214,8 +214,6 @@ This will update our `Value` object with the sensor readings via the
 `Value` object now notifies the property and the thing that the value
 has changed, which in turn notifies all websocket listeners.
 
-## Adding to Gateway
+## Acknowledgements
 
-To add your web thing to the WebThings Gateway, install the "Web Thing"
-add-on and follow the instructions
-[here](https://github.com/mozilla-iot/thing-url-adapter#readme).
+Python Thing Server was originally based on the [Mozilla IoT Python-WebThing library](https://github.com/mozilla-iot/webthing-python).