How to avoid readxl using ..1, ..2 as variable names

[mishabalyasin]

@mara replied in a similar thread:

Ho to rename tibble's .name_repair columns with dplyr

Bug https://github.com/tidyverse/tibble/issues/566#issuecomment-464370735 The problem with ..1 and ... (and also with ``) is that these names not only not syntactic, they're invalid even as a quoted name.