Tweak archive name for Ubuntu since we now support two versions
Tweak archive name for Ubuntu since we now support two versions

jtbm37/omnisharp-roslyn,DustinCampbell/omnisharp-roslyn,nabychan/omnisharp-roslyn,nabychan/omnisharp-roslyn,DustinCampbell/omnisharp-roslyn,OmniSharp/omnisharp-roslyn,OmniSharp/omnisharp-roslyn,jtbm37/omnisharp-roslyn