stringr breaking changes

• v1.5.1 \u2192 v1.6.0breaking

  All relevant stringr functions now preserve names (@jonovik, #575).

• v1.5.1 \u2192 v1.6.0breaking

  `str_like(ignore_case)` is deprecated, with `str_like()` now always case sensitive to better follow the conventions of the SQL LIKE operator (@edward-burn, #543).

• v1.5.1 \u2192 v1.6.0breaking

  In `str_replace_all()`, a `replacement` function now receives all values in a single vector. This radically improves performance at the cost of breaking some existing uses (#462).

• v1.4.1 \u2192 v1.5.0breaking

  stringr functions now consistently implement the tidyverse recycling rules (#372). There are two main changes:

• v1.4.1 \u2192 v1.5.0breaking

  Only vectors of length 1 are recycled. Previously, (e.g.) `str_detect(letters, c("x", "y"))` worked, but it now errors.

• v1.4.1 \u2192 v1.5.0breaking

  `str_c()` ignores `NULLs`, rather than treating them as length 0 vectors. Additionally, many more arguments now throw errors, rather than warnings, if supplied the wrong type of input.

• v1.4.1 \u2192 v1.5.0breaking

  `regex()` and friends now generate class names with `stringr_` prefix (#384).

• v1.4.1 \u2192 v1.5.0breaking

  `str_detect()`, `str_starts()`, `str_ends()` and `str_subset()` now error when used with either an empty string (`""`) or a `boundary()`. These operations didn't really make sense (`str_detect(x, "")` returned `TRUE` for all non-empty strings) and made it easy to make mistakes when programming.

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