Update go-singleflight-streams to handle weird EOF behaviour from minio #507
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Fixes #504
In short, minio was returning EOF on the last read, but sfstreams wasn't monitoring for that. When the next read happened, sfstreams proxied it to minio, which then promptly tried to send the range request, which fails.
By having sfstreams track the EOF on the read, we can bypass the second range request.