Bump electron from 4.2.12 to 7.2.4

Bumps [electron](https://github.com/electron/electron) from 4.2.12 to 7.2.4.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/master/docs/breaking-changes.md)
- [Commits](https://github.com/electron/electron/compare/v4.2.12...v7.2.4)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -141,7 +141,7 @@
     "css-loader": "^0.28.11",
     "del": "^3.0.0",
     "devtron": "^1.4.0",
-    "electron": "^4.2.12",
+    "electron": "^7.2.4",
     "electron-builder": "^21.2.0",
     "electron-devtools-installer": "^2.2.4",
     "eslint": "^4.19.1",