glue 1.8.0

• glue has a two new articles:

  • "Get started", with contributions from @stephhazlitt and @BrennanAntone
    (#137, #170, #332).
  • How to write a function that wraps glue (#281).

• If the last argument of glue() is empty, it is dropped (#320). This makes
  it easy to structure glue() calls with one argument per line, and to anticipate adding arguments:

  glue(
    "here's some text, ",
    "and maybe more text will be added in the future?",
  )

• glue_sql("{var*}") once again generates NULL if var is empty.
  This reverts #292. (#318).

• The .envir argument to glue() and glue_data() really must be an
  environment now, as documented. Previously a list-ish object worked in
  some cases (by accident, not really by design). When you need to lookup
  values in a list-ish object, use glue_data(.x =) (#308, #317).
  Ditto for glue_sql() and glue_data_sql().