Compilation fails: undefined: proxy.NewProvider

[probonopd]

Using Go 1.1.9:

% go install github.com/rapid7/go-get-proxied@master
# github.com/rapid7/go-get-proxied
home/user/go/pkg/mod/github.com/rapid7/go-get-proxied@v0.0.0-20220112221009-42bdac6386fc/main.go:69:15: undefined: proxy.NewProvider
home/user/go/pkg/mod/github.com/rapid7/go-get-proxied@v0.0.0-20220112221009-42bdac6386fc/main.go:83:14: undefined: proxy.NewProvider

(Note to future self: Need this for https://github.com/aus/proxyplease)