v0.32.0

Added

• #187: For csv sources, sq will now try to auto-detect if the CSV file
  has a header row or not. Previously, this needed to be explicitly specified
  via an awkward syntax:

  $ sq add ./actor.csv --opts=header=true

  This change makes working with CSV files significantly lower friction.
  A command like the below now almost always works as expected:

  $ cat ./actor.csv | sq .data

  Support for Excel/XLSX header detection is in #191.

Fixed

• sq is now better at detecting the (data) kind of CSV fields. It now more
  accurately distinguishes between Decimal and Int, and knows how to
  handle Datetime.

• #189: sq now treats CSV empty fields as NULL.