add threadz note

README.md

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 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
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+> 💡 If you are teaching at the University of British Columbia, you may also be interested in the tool `Threadz` which provides visualizations and data from your Canvas discussion forums through a user interface in Canvas. You can learn more about the tool and how to request access in your course from the [LTHub Instructor Guide](https://lthub.ubc.ca/guides/threadz-instructor-guide/).
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 # Canvas Discussion
 This project pulls data via the Canvas API the discussions for the specified Canvas course(s) and exports the results as CSV. The columns exported are:
 * 'topic_id',