Is your feature request related to a problem? Please describe.

The Rust client uses hyper v0.14, while v1.1.0 exists. Presumably the more modern v1 release should be used.

Describe the solution you'd like

A update to the generator to use hyper v1.

Describe alternatives you've considered

There could be a feature to allow using the newer or older hyper version, in case this is used by people still on hyper v0.14 who don't want to ship both versions.