oops forgot to define y. 🍤

Update release notes

Update Authors@R

Merge branch 'master' of github.com:hadley/dplyr

Merge pull request tidyverse#668 from csgillespie/patch-1

Update introduction.Rmd

Update cran comments

Update submission notes

Bump version and tweak news

Don't run microbenchmark during tests for BDR

Cran RC