Avoid auto update check in development environment

[Gisonrg]

Hi, thanks for this awesome product!

I tried to build it on my desktop, even though the app could start normally, I got this error:

Error: ENOENT, dev-app-update.yml not found

in the console. Google search leads me to this issue on electron-builder, and the suggestion from the discussion is to avoid doing auto update check in the dev environment.

Personally I felt it's meaningless to do the auto update check in development environment as well if we are creating the "latest" version 😛 )

We could try using the electron-is-dev to do the environment check as they suggested.

[hackjutsu]

@Gisonrg

Thanks for the suggestion :) Yes, it's meaningless to check for updates in a DEV environment. I'm OK with adopting the electron-is-dev package.

If you like, feel free to send a PR.

[Gisonrg]

Cool, I will submit a PR when I am free over the weekend 👍

Sorry for mistakenly close the issue...