support draft releases for in and out

* in will pull in the latest release, even if draft. It will not create
  the files `tag` and `version`, if no tag is defined on the draft
  release.
* out will push a release in a draft state when provided as a param

[#102513822]

Signed-off-by: David Morhovich <dmorhovich@pivotal.io>

out_command.go

@@ -52,10 +52,13 @@ func (c *OutCommand) Run(sourceDir string, request OutRequest) (OutResponse, err
 		}
 	}
 
+	draft := request.Params.Draft
+
 	release := &github.RepositoryRelease{
 		Name:            github.String(name),
 		TagName:         github.String(tag),
 		Body:            github.String(body),
+		Draft:           github.Bool(draft),
 		TargetCommitish: github.String(targetCommitish),
 	}