Incorrect build instructions

[fgm]

Problem description

With the current "Build and test" instructions in the readme:

• there is an error on vagrant up because the https://github.com/smartystreets/assertions package now needs Go 1.13 (for errors.Is but the VM provides Go 1.9
• the go test ./... instructions don't work because /go is root:root but the VM guest user id vagrant:vagrant so the go tool can't download the dependencies
• when adding a such chown -R vagrant:vagrant /go the go tool downloads success, but the build fails because of https://github.com/smartystreets/assertions dependency on Go 1.13 again.

Suggested changes

• In the short term, upgrade to Go 1.17 since this is the current version
• In the longer term convert to docker for ease of use/speed.