arctools 1.1.3

• Minor changes in vignette.

arctools 1.1.2

• Replace Travis and AppVeyor with GitHub Actions.
• Added notes to the documentation about using lubridate::ymd_hms().

arctools 1.1.0

• Added a NEWS.md file to track changes to the package.
• Added a protective step in midnight_to_midnight to protect from errors coming from providing a function with base::as.POSIXct()-generated timestamp (not ok) instead of lubridate::ymd_hms()-generated timestamp.