Update About box to show compatibility with nuget 1.8
Update About box to show compatibility with nuget 1.8

dsplaisted/NuGetPackageExplorer,campersau/NuGetPackageExplorer,NuGetPackageExplorer/NuGetPackageExplorer,NuGetPackageExplorer/NuGetPackageExplorer,BreeeZe/NuGetPackageExplorer