Add prebuilds for Electron 12

[azeier]

Electron 12 was released on Monday:
https://github.com/electron/electron/releases/tag/v12.0.0

[azeier]

The travis CI failure appears to be unrelated?
docker: Error response from daemon: pull access denied for node-keytar/arm64-cross-compile, repository does not exist or may require 'docker login'.

[David-Development]

Is there an ETA for this? Is there any way to build this locally until it is merged?

[azeier]

Updated for conflict with 1d53fd5.

@shiftkey Hey, anything else I can do to help get this merged?

[sirtimid]

+1

[shiftkey]

@shiftkey Hey, anything else I can do to help get this merged?

@azeier I'd ignore that Travis error but sadly that's required for publishing a new release so I'm chasing up getting admin rights so I can complete #334 and finally get away from Travis and Appveyor. Hopefully in the next day or so we can be ready to publish this in a release.

[shiftkey]

@azeier actually, this might be a legit failure:

Error: Could not detect abi for version 12.0.0 and runtime electron.  Updating "node-abi" might help solve this issue if it is a new release of electron

Is this branch rebased on master? We updated node-abi recently which is often necessary when new Electron releases are available...

[azeier]

I initially had the node-abi upgrade in this PR as well, before master was updated with the new node-abi version.

Though it looks like I just dropped that commit and didn't rebase. Did that now, let's see!

[azeier]

So it looks like the original travis issue is now resolved on the more recent linux builds.

But the osx build error is still the same even with after the rebase on master.

Edit: Attempted updating the package.json as well, but as expected, that has no impact since it's updated in the lockfile anyways. Let me know if you want me to drop that again.

The github macos build seems to be just fine.

[shiftkey]

I tested #366 fresh on top of the latest changes and I couldn't spot anything wrong.

Thanks for the contribution anyway @azeier!