[R-package] fixed evaluation on valids in lightgbm() (fixes #2915)#2916

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jameslamb merged 1 commit intomicrosoft:masterfrom jameslamb:bugfix/lightgbm-validation

Mar 22, 2020

+61-13

Commits on Mar 15, 2020

[R-package] fixed evaluation on valids in lightgbm() (fixes microsoft#2915 )
jameslamb
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