refactor(packager): upgrade to Electron Packager 8.5.0

version is deprecated in favor of electronVersion.

package.json

@@ -96,7 +96,7 @@
     "commander": "^2.9.0",
     "debug": "^2.3.3",
     "electron-installer-dmg": "^0.1.2",
-    "electron-packager": "^8.4.0",
+    "electron-packager": "^8.5.0",
     "electron-rebuild": "^1.5.5",
     "electron-sudo": "malept/electron-sudo#fix-linux-sudo-detection",
     "electron-windows-store": "^0.7.2",

src/api/package.js

@@ -92,7 +92,7 @@ export default async (providedOptions = {}) => {
     arch,
     platform,
     out: path.resolve(dir, 'out'),
-    version: packageJSON.devDependencies['electron-prebuilt-compile'],
+    electronVersion: packageJSON.devDependencies['electron-prebuilt-compile'],
   });
   packageOpts.quiet = true;
   if (typeof packageOpts.asar === 'object' && packageOpts.asar.unpack) {