vroom v1.5.4

• vroom(col_types=) now accepts column type names like those accepted by utils::read.table. e.g.
  vroom::vroom(col_types = list(a = "integer", b = "double", c = "skip"))

• vroom() now respects the quote parameter properly in the first two lines of the file (tidyverse/readr#1262)

• vroom_write() now always correctly writes its output including column names in UTF-8 (tidyverse/readr#1242)

• vroom_write() now creates an empty file when given a input without any columns (tidyverse/readr#1234)