Changes order for yarn command on setup.go
Changes order for yarn command on setup.go

Changes yarn command from yarn --no-progress install to yarn install
--no-progress". Otherwisei, yarn get confused (because it does not
identifies the command) and throws the following:

```bash
--> yarn --no-progress install
error `install` has been replaced with `add` to add new dependencies.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation
about this command.
```

Tested on yarn 0.27.5

markbates/buffalo,gobuffalo/buffalo,gobuffalo/buffalo