docs: Remove greenkeeper reference from readme, as it is being retired #844
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This is a very small change to the README, not an actual issue (not a bug or feature request) so I am not sure about how to handle it. In the contributing guidelines I could not find instructions. Maybe it would be a good addition (under docs category)?
Anyway, while checking the repository, I noticed you reference greenkeeper in the README, but it is going to be taken down in less than a month, so I think it is better to avoid stale links.