[R-package] Add version floor of R 3.5 (fixes #3212) #3216
Merged
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This PR proposes moving the version floor on the R package up, from R 3.4 (April 2017) to R 3.5 (April 2018).
I think that this PR will improve LightGBM's R package in the following ways:
USE_R35
) that users have to think aboutSee the evidence in #3212 for why I think this will have minimal impact on our current users.