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Javier LuraschiKrisztián Szűcs
71c0554adad
Javier Luraschi authored and Krisztián Szűcs committed 71e25769633
ARROW-3804: [R] Support older versions of R runtime

`vctrs` requires `3.1`: https://github.com/r-lib/vctrs/blob/master/DESCRIPTION#L15, but no functionality makes use of `3.5`, at least, not yet.

Fix for: https://issues.apache.org/jira/browse/ARROW-3804

Author: Javier Luraschi <javierluraschi@hotmail.com>
Author: Romain Francois <romain@rstudio.com>

Closes #2978 from javierluraschi/bugifx/r-version and squashes the following commits:

a0f153f10 <Romain Francois> testing on released R
105f6a187 <Javier Luraschi> also match travis r version
1fcf99a1e <Javier Luraschi> lower requirement of r runtime