Use backslashes for nupkg push

build.js

@@ -34,7 +34,7 @@ if (bt.options.official)
     // Push nuget package
     var pushTo = bt.options.version.suffix ? "\"Topten GitHub\"" : "\"nuget.org\"";
     bt.run(`dotnet nuget push`,
-           `./Build/Release/*.${bt.options.version.build}${bt.options.version.suffix}.nupkg`,
+           `.\\Build\\Release\\*.${bt.options.version.build}${bt.options.version.suffix}.nupkg`,
            `--source ${pushTo}`);
 }