Fix hiddenArg not working on windows.

[razzeee]

This should fix the hidden args being ignored when calling squirrel/update.exe.
See: https://github.com/Squirrel/Squirrel.Windows/blob/ee32fb469fc1ace0af6aef7edc389e27b8c063bb/src/Update/Program.cs#L128

Probably closes #31

[adam-lynch]

OK thanks but this module supports NW.js and Electron users who don't use Squirrel. We could either an option that basically says "I'm using Squirrel" or somehow detect it? Not sure how reliable that would be.

[razzeee]

Okay thought that might be the case, but didn't think that those also have updateDotExe

Edit: No clue how we could detect it

[adam-lynch]

but didn't think that those also have updateDotExe

Woops, yeah that makes sense. But doesn't that mean you should only change the args inside the if fs.existsSync(updateDotExe) and versions.electron and leave it as it was outside?

[razzeee]

Damn, that makes so much sense and could solve all our problems. PR update incoming.
Thx @adam-lynch

[adam-lynch]

4.0.1 is now published with this fix. Thanks very much @razzeee 👍

[razzeee]

Thank you for bringing me to the conclusion