enabled no-floating-promises eslint rules to prevent #3 from happening again

.eslintrc.js

@@ -16,6 +16,7 @@ module.exports = {
   },
   ignorePatterns: ['.eslintrc.js'],
   rules: {
+    '@typescript-eslint/no-floating-promises': 'error',
     '@typescript-eslint/interface-name-prefix': 'off',
     '@typescript-eslint/explicit-function-return-type': 'off',
     '@typescript-eslint/explicit-module-boundary-types': 'off',

src/main.ts

@@ -6,4 +6,4 @@ async function bootstrap() {
   const app = await NestFactory.create<NestExpressApplication>(AppModule);
   await app.listen(3000);
 }
-bootstrap();
+void bootstrap();