The one where we made the last 3.x changes

This will be the last release with new features in the 3.x version line.
The next major release will be 4.0 which is currently being worked on with many exciting, new, backwards-incompatible features.

• #255 - Don't reuse empty body on retry (thx @cristoper)
• #247 - Add variant response property presentment_prices (thx @xdlbdy )
• #254 - Add endpoint for payments and order risk (thx @AlBaraa-mohamed )