Update link to get the latest nuget.exe

This should fix RestorePackages

.nuget/NuGet.targets

@@ -115,7 +115,7 @@
 
 					Log.LogMessage("Downloading latest version of NuGet.exe...");
 					WebClient webClient = new WebClient();
-					webClient.DownloadFile("https://nuget.org/nuget.exe", OutputFilename);
+					webClient.DownloadFile("https://dist.nuget.org/win-x86-commandline/latest/nuget.exe", OutputFilename);
 
 					return true;
 				}