r: Install cowplot & rlang from CRAN
r: Install cowplot & rlang from CRAN

Installing them was failing on CircleCI, and they are
coming from cran anyway

berkeley-dsep-infra/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub