update readme for 0.3.x release
update readme for 0.3.x release

DanielBMann9000/vso-agent,DanielBMann9000/vso-agent,DanielBMann9000/vso-agent,DanielBMann9000/vso-agent,DanielBMann9000/vso-agent,Microsoft/vso-agent,Microsoft/vso-agent,Microsoft/vso-agent,Microsoft/vso-agent,Microsoft/vso-agent,Microsoft/vso-agent