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Merge pull request #262 from smola/go-travis

ci: test Go 1.9.x, 1.10.x and tip

Merge branch 'devel'

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do not remove the first field in updates

Signed-off-by: Miguel Molina <[email protected]>

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Update cmd.go

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Merge pull request #209 from erizocosmico/docs/clarify-remove-notempty

clarify the relationship to remove must not be empty