Fix Microsoft Defender alert for uninstaller #114

Microsoft Defender considers the uninstaller virus. It's a
false-psoitive caused by `electron-builder` used to build NSIS package.

This commit solves the issue by explicitly adding `electron-builder` as
dependency. This way, `vue-cli-plugin-electron-builder` always resolves
to the desired version. Now the version used for `electron-builder` is
more controlled. New uninstaller generated by latest specified patch
does not trigger an alert, which solves the false-positive issue.

See also:
  - electron-userland/electron-builder#4793,
  - electron-userland/electron-builder#4878.