Broken link to colab notebook

[dtch1997]

FYI I tried to open the "poison detection" colab from your main checkout but it doesn't appear to exist.

Current commit hash: 88237c3

Error message:

Fetch for https://api.github.com/repos/EleutherAI/bergson/contents/notebooks?per_page=100&ref=colab-notebooks-v2 failed: {
  "message": "No commit found for the ref colab-notebooks-v2",
  "documentation_url": "https://docs.github.com/v3/repos/contents/",
  "status": "404"
}

CustomError: Fetch for https://api.github.com/repos/EleutherAI/bergson/contents/notebooks?per_page=100&ref=colab-notebooks-v2 failed: {
  "message": "No commit found for the ref colab-notebooks-v2",
  "documentation_url": "https://docs.github.com/v3/repos/contents/",
  "status": "404"
}

    at new IT (https://ssl.gstatic.com/colaboratory-static/common/109a37e86ed3b8b666a8d8c4223592a4/external_binary_es6.js:2933:317)
    at https://ssl.gstatic.com/colaboratory-static/common/109a37e86ed3b8b666a8d8c4223592a4/external_binary_es6.js:2922:328
    at Generator.next (<anonymous>)
    at b (https://ssl.gstatic.com/colaboratory-static/common/109a37e86ed3b8b666a8d8c4223592a4/external_binary_es6.js:6:40)

[luciaquirke]

@norabelrose is this yours?