v1.4.0 Release

This release includes a Package.swift for SwiftPM support.

Minor fixes:

• #337 ServiceGenerator support for optionally trying to parse text/html replies (for misconfigured servers).
• #346 Support mime payloads (batch replies) where that are successful but with no payload (delete, etc.)
• #361 Fix up some comment formatting in html when the service returned forced line breaks in odd places.