Add warning about missing template

Hopefully this will stave off some initial confusion when someone tries to use a template that doesn't have a beta branch in its repo.w
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Ben Scheirman 2017-12-28 07:59:53 -06:00 committed by GitHub
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@ -16,6 +16,8 @@ vapor new Hello
!!! warning
Make sure to add `--branch=beta` while using Vapor 3 pre-release.
If you receive an error that looks like this: 'Cloning Template [Failed]' then the template you are using is not yet ready for the beta branch. Try a different template.
Once that finishes, change into the newly created directory.