pins 1.0.3

• The arrow package is now suggested, rather than imported (#644, @jonthegeek).

• Fixed how Connect usernames are handled in messages, preview, etc (#643).

• Increased datetime precision to the second, for pin_versions() and related
  functions (#642, @tomsing1).

• Pass the dots from pin_write() through to s3_upload_file() and
  s3_uploade_yaml() to support S3 tagging, encryption options, etc for
  pins (#648, #652, @fh-mthomson).