improve another error when restoring packages.

[matthid]

Related #2423

Instead of

Paket failed with:
-> Could not download FSharp.Core 4.2.
       Could not get package details for Paket.NuGetV2+name@255-5 from https://www.nuget.org/api/v2

print

Paket failed with:
-> Could not download FSharp.Core 4.2.
-> Could not get package details for Paket.NuGetV2+name@255-4 from https://www.nuget.org/api/v2
-> WebException: The remote server returned an error: (404) Not Found.

WTF is Paket.NuGetV2+name@255-4? PackageName overrides ToString but it is not working?

[lexarchik]

Paket.NuGetV2+name@255-4 come from typo on line 255 in NuGetV2.fs:
let name = PackageName.ToString() must be let name = packageName.ToString()

[matthid]

@lexarchik Thanks! I just couldn't see it :)