Document required github token permissions #199

We have escaped applying the changesets, and no files should have been affected
[50](https://abc/runs/74472656?check_suite_focus=true#step:9:51)
🦋  error Error: An error occurred when fetching data from GitHub
[51](https://abc/runs/74472656?check_suite_focus=true#step:9:52)
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[52](https://abc/runs/74472656?check_suite_focus=true#step:9:53)
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