Update gitignore (sorry)

electron/node_modules/app-builder-lib/out/errorMessages.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.authorEmailIsMissed = void 0;
+exports.authorEmailIsMissed = `Please specify author 'email' in the application package.json
+
+See https://docs.npmjs.com/files/package.json#people-fields-author-contributors
+
+It is required to set Linux .deb package maintainer. Or you can set maintainer in the custom linux options.
+(see https://www.electron.build/configuration/linux).
+`;
+//# sourceMappingURL=errorMessages.js.map