612 fix powershell error

Summary of changes

This PR solves the issue #612 I changed the release_rc_win_main.ps1.eex powershell template at row 103 because it was using a wrong keyword for the command set-content. I removed the keyword -InputObject and I put -Value instead. Now the error Set-Content : A parameter cannot be found that matches parameter name 'InputObject'. has gone away and the WARNING_README file is being created regularly.

Checklist

[ ] New functions have typespecs, changed functions were updated
[ ] Same for documentation, including moduledocs
[ ] Tests were added or updated to cover changes
[x] Commits were squashed into a single coherent commit

Licensing/Copyright

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bitwalker / distillery