v1.0-rc.3

Add README

v1.0-rc.2

Add make step for all os

v1.0-rc.1

Refactor the use of ArtifactResolution. Add multi-download sub commmand.

Remove the licensing comment in main.go
Remove the function to get sha1.
Add GetArtifactResolution.
Set the repository according to version if blank.
Add a multi-download commands that reads from file.