Missing `--draft` switch in shell snippet

[Claudia Pellegrino]

cookiecutter-vscode-extension/{{ cookiecutter.project_slug }}/README.md

Line 125 in 2260971

 gh release create --generate-notes --prerelease "${tag}" 

This needs a --draft switch added so the user has a chance to review the release before it’s submitted.

Reviewing the release is important because:

• the GitHub-generated release notes may include unwanted noise, which the user may want to remove; and

• the user may want to change their mind about the --prerelease switch.

[Claudia Pellegrino]

Closed via #35.