Contributing guide should document required scopes for integration tests

[martincostello]

The contributing guide should specify what OAuth token permissions are required for the integration tests to all run and pass.

I generated a new token to use for the integration tests using various read scopes, to find that a few tests failed because they needed write permissions to create, delete, start and unstar projects.

[grokys]

Will do this shortly. For reference the required scopes are: delete_repo, read:discussion, read:org, read:public_key, read:user, repo.

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