Added Acknowledgements

Author: jtc42

README.md

@@ -2,4 +2,8 @@
 
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
-Python implementation of the LabThings API structure, based on the Flask microframework.
+A Python implementation of the LabThings API structure, based on the Flask microframework.
+
+## Acknowledgements
+
+Much of the code surrounding default response formatting has been liberally taken from [Flask-RESTful](https://github.com/flask-restful/flask-restful). The integrated [Marshmallow](https://github.com/marshmallow-code/marshmallow) support was inspired by [Flask-Marshmallow](https://github.com/marshmallow-code/flask-marshmallow) and [Flask-ApiSpec](https://github.com/jmcarp/flask-apispec).