Removed -NoNewLine parameter from Set-Content

[lipkau]

Set-Content only supports the -NoNewLine parameter starting with Windows Powershell 5
closes #15

not sure if you want the PR to increment the psd1 version

[lipkau]

I tested the command with

1..20| % {Update-Metadata -Path $path -PropertyName Author -Value $_}

And the .psd1 file had exactly the same amout of new lines at the end.

[Jaykul]

We need to support older PowerShell versions, and the extra empty line isn't hurting anyone.