docs(readme): add Go 1.17+ install command

[nikoksr]

Summary

Hi @davecheney, this PR is to bring the readme up to date with Go 1.17 and only brings a small addition to the installation instructions.

Proposed Changes

• Add new install command for Go versions 1.17+ to readme

Reason

Starting in Go 1.17, installing executables with go get is deprecated. go install may be used instead.

Read here for more info about this.

[davecheney]

TYVM