AppVeyor: Enable build for x64 and x86
AppVeyor: Enable build for x64 and x86

RocketChat/Rocket.Chat.Electron,ZedTheYeti/Rocket.Chat.Electron,ZedTheYeti/Rocket.Chat.Electron,RocketChat/Rocket.Chat.Electron,RocketChat/Rocket.Chat.Electron,ZedTheYeti/Rocket.Chat.Electron