v4.0.0

Breaking

• Require Node.js 12.20 097d249
• This package is now pure ESM. Please read this.
• The host option no longer has a default and must be specified.
  • It used to default to 'localhost', but that default doesn't make a lot of sense since this package works with remote endpoints too and some users were confused about it.

v3.1.0...v4.0.0