dplyr 1.0.8

• Better display of error messages thanks to rlang 1.0.0.

• mutate(.keep = "none") is no longer identical to transmute().
  transmute() has not been changed, and completely ignores the column ordering
  of the existing data, instead relying on the ordering of expressions
  supplied through .... mutate(.keep = "none") has been changed to ensure
  that pre-existing columns are never moved, which aligns more closely with the
  other .keep options (#6086).

• filter() forbids matrix results (#5973) and warns about data frame
  results, especially data frames created from across() with a hint
  to use if_any() or if_all().

• slice() helpers (slice_head(), slice_tail(), slice_min(), slice_max())
  now accept negative values for n and prop (#5961).

• slice() now indicates which group produces an error (#5931).

• cur_data() and cur_data_all() don't simplify list columns in rowwise data frames (#5901).

• dplyr now uses rlang::check_installed() to prompt you whether to install
  required packages that are missing.

• storms data updated to 2020 (@steveharoz, #5899).

• coalesce() accepts 1-D arrays (#5557).

• The deprecated trunc_mat() is no longer reexported from dplyr (#6141).