update to Electron v4.1.1

I have an old gpu GeForce GT 710, so ElectronDisplay and the Electron version used by ElectronDisplay fail with `[12403:0501/015424.003689:FATAL:gpu_data_manager_impl_private.cc(439)] GPU process isn't usable. Goodbye.`
 But latest version of electron.jl(Electron v4.1.1) doesn't  have the issue. So, I think updating to Electron v4.1.1 will solve the error. 

