v0.2.0

storywranglr 0.2.0

• Bugfix: Empty ngrams queries no longer crash, and now return a zero-row tibble
  with the correct column types.
• Feature: storywranglr::ngrams() new parameter fill_dates gives the
  option to fill in missing date rows with rows of NA values.
• Removed unnecessary dependencies on packages "stringi" and "pillar".